Answers:
China does not, Japan does. There are many products in Japan that never make it to the States. A prime example is if you go to Sony's US website and compare it with Japans. Although many products are made in China the technology is owned by other countries.
China is experimenting with laser technology for use on the battlefield and developing a more sophisticated space program.
it depends on which category you are asking.
generally speaking, US has advanced techonology on some areas, such as weapons, spy satellites, building of aircrafts, aircraft carriers, etc.
China is catching up very quickly, that is why the US government is limiting its high tech products exporting to China. And often, people who are found to break the laws of exporting, they are put in prisons simply for exporting prohibitted products to China.
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