题目内容

注射模的排气方式有( )和( )。排气槽通常开设在型腔( )部位。最好开在( )上,并在( )一侧,这样即使在排气槽内产生飞边,也容易随塑件脱出。

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Z1-03-18 质点作直线运动,位置矢量的方向一定不变。

A. 对
B. 错

Z1-03-22物体具有恒定的加速度,必作匀加速直线运动.

A. 对
B. 错

The author’s purpose in writing this passage is to explain .

A. why it is necessary for us to help others
B. how to help others
C. who most need help
D. what community service is

The main idea of Para. 2 is that .

A. many people need help, but nobody sees and gives it
B. the organizations must depend on voluntary help
C. special help should be given to those who cannot easily get help
D. it is necessary to form organizations to give help to those who need it

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