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Photo shows the Tiktok app icon (upper right corner) on a smartphone screen. [Photo/Xinhua]

With the rise in what some call "techno-nationalism" in the United States, Chinese companies are facing national security accusations by the US on a broad front-from telecom giant Huawei to popular video app TikTok.

However, three of the four CEOs of major US tech companies that testified on Capitol Hill this past week said they had no knowledge of technology theft by China at their businesses. Their responses contrast with the relentless hunt by the US administration for culprits among Chinese tech companies.

The four CEOs-Tim Cook of Apple, Sundar Pichai of Google's parent Alphabet, Jeff Bezos of Amazon and Mark Zuckerberg of Facebook-were asked on Wednesday at a House Judiciary subcommittee hearing investigating the practices of major US technology companies whether they believed the Chinese government was stealing intellectual property from US companies.

"I know of no case of ours where it occurred," Cook replied to the question posed by Representative Greg Steube, a Florida Republican."I can only speak to firsthand knowledge."

During Cook's opening statement, he called iPhone maker Apple "a uniquely American company". But he also praised Shenzhen-based Huawei, which the US has worked to portray as a national security threat and has coaxed some of its allies to shun the company's gear, as a leader in 5G mobile technology.

"We also know that customers have a lot of choices and that our products face fierce competition,"Cook said."Companies like Samsung, LG, Huawei and Google have built successful businesses with different approaches. We're OK with that. Our goal is the best, not the most."

Pichar said: "I have no firsthand knowledge of any information stolen from Google", which runs the world's most widely used search engine.

Bezos, the world's richest person who runs an omnipresent e-commerce company, mulled the question out loud before answering that it was something "I've read reports of, but don't have personal experience."

Zuckerberg said the allegations of technology theft were "well documented", but didn't provide any specific examples.

He said the fastest-growing app in the world is TikTok, a social media video platform owned by the Chinese company ByteDance.

"History shows that if we don't keep innovating, someone will replace every company here today....If you look at where the top technology companies come from, a decade ago, the vast majority were American. Today, almost half are Chinese."

Zuckerberg's testimony seemed at odds with his previously expressed ardor for China.

In October 2014, he held a 30-minute question-and-answer session entirely in Mandarin at Tsinghua University in Beijing, when he had joined the school's advisory board.

"I'm very glad to be in Beijing," he said to the audience that day. "I love this city. My Chinese is really a mess, but I study using Chinese every day."

At a Canada-China Economic Forum on Monday, Paul Evans, a professor in the School of Public Policy and Global Affairs at the University of British Columbia, said the ban on Huawei's 5G technology is just "the tip of a very large iceberg in the chilly waters of techno-nationalism".

Xu Liping, a senior fellow at the National Institute of International Strategy of the Chinese Academy of Social Sciences, said the US administration has been painstakingly looking for evidence to support its false claim that China has stolen their high-tech technology. But the answers from these tech firm leaders made its lies fall apart, Xu said.

"Some US politicians, who speculate that China has stolen their technology, underestimate Chinese people's wisdom and technological innovation," he said.

He said that with globalization, the science and technology gap between countries has been narrowed in the past few decades. But some US politicians think China's technology level remains at what it was three to four decades ago, an attitude that he said goes against common sense.

"Politicizing high-tech development will hurt both sides, and the rational thing for the US to do is to boost technological exchanges with China rather than find faults with China and Chinese companies," he said.

"What the US did to Huawei will also affect its own technological development."

He said that high-tech development requires high investment as well as a consumer market for the products. Thus, a Chinese market that uses US technological products will further help the US boost its high-tech research and development."That is a virtuous cycle," he said.

Alexander Capri, a researcher at the Hinrich Foundation, said with the "techno-nationalism" in the US, foundational and emerging technologies and all forms of tech collaboration-such as cross-border research and development and exchanges between academics-are now falling under an extensive export-control umbrella. These trends are leading to a technology cold war between the US and China, he said.

"We see the US getting TSMC(Taiwan Semiconductor Manufacturing Company) to pledge to build a plant in the US and now there's a huge amount of funding that's going to come out to relocate semiconductor manufacturing to the United States, so this is all part of this decoupling process," he said.

David Kappos, a former undersecretary of commerce for intellectual property and director of the US Patent and Trademark Office, said:"Threats aren't going to go very far with China anymore. They've got a huge economy and they can rival us in that regard. Logic, and fact and data are going to go a long way.

"There will be competition, there will be tension and challenges, and interests that are not always aligned, but there's also a lot to be gained from cooperation."