当()和主臂夹角小于10°时,伸缩限制开关限制举升臂做伸缩动作。
A.曲臂
B.直臂
C.弯臂
D.组合臂
参考答案:A
the deadline approaching, we found ourselves a loss about what to do.
A.With; at
B.As; about
C.As; for
D.With; by
以下不属于风险转移方法的是( )。
A.保险B.分散投资C.套期保值D.互换