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简述香石竹病毒病的防治措施。

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问题：什么是带传动？传动带有哪几种主要类型？

问题： 1．机器与机构的区别是什么？ 2．机器的生产过程包括哪些内容？

He said he had ________ the performanceof the new model and was surprised at what he had seen then.

A. endeavored
B. demonstrated
C. witnessed
D. judged

Three people were killed in a head-on________ between a bus and a car.

A. collapse
B. collision
C. conflict
D. crush