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简述演讲的定义。

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绿叶类蔬菜有哪些共同特点？

传动方式在什么情况下可以省略代号.

钢丝绳涂脂无论用何种方法，均要涂抹均匀。

A. 正确
B. 错误

Injectors on modern engines are cooled by a combination of the intensive bore cooling in the cylinder by a combination of the intensive bore pockets and by the fuel which is re-circulated through the injector when the follower is on the （）of the cam or when the engine is stopped.

A. slope
B. base
C. top
D. bottom