减速箱是一个角传动装置，用来改变动力传递（）及降低速度。当动力及速度无法改变时，应停车检查减速箱。
A、时间
B、方向
C、大小
D、快慢
参考答案：C
Overpopulation is a terrible threat to the human race. Yet it is probably ______ a threat to the human
race than environmental destruction. [ ]
A. no more
B. not more
C. even more
D. little more
简述交叉杆检修的基本工艺过程？
