修井机按其提升能力有多种型号。不属于其组成部分的是（）。
A、动力系统
B、传动系统
C、提升系统
D、下井系统
参考答案：D
绝对值不大于5的整数有
[ ]
A.4个
B.5个
C.10个
D.11个
Little ________ about her own safety, though she was in great danger herself.[ ]
A. did Rose care
B. Rose did care
C. Rose does care
D. does Rose care
