将两句合成一句:Several coutries have sent up spaceships.The spaceships mainly useelectronis controls..Several countries have sent up spaceships()mainly use electronic cintrols.

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将两句合成一句:Several coutries have sent up spaceships.The spaceships mainly useelectronis controls..Several countries have sent up spaceships()mainly use electronic cintrols.

将两句合成一句:Several coutries have sent up spaceships.The spaceships mainly useelectronis controls..Several countries have sent up spaceships()mainly use electronic cintrols.
将两句合成一句:Several coutries have sent up spaceships.The spaceships mainly use
electronis controls..
Several countries have sent up spaceships()mainly use electronic cintrols.

将两句合成一句:Several coutries have sent up spaceships.The spaceships mainly useelectronis controls..Several countries have sent up spaceships()mainly use electronic cintrols.
which

Several countries have sent up spaceships (which) mainly use electronic cintrols.