单项选择题
To avoid shock ,you should reduce speed by（）（低速）control.
A. low speed B. high speed C. inching D. slow speed
单项选择题 This is a（）（侧滚动）type hatch cover.
单项选择题 We need plenty of （）(绑扎钢丝).
单项选择题 （）(夹子)have been used up.
