吊运炽热金属或易燃、易爆等危险品的起重机应设两套()。
A、大车限位
B、上升限位
C、缓冲器
参考答案：B
下列告知受术者的负压吸宫术后注意事项中错误的是（）
A.注意休息、营养
B.禁性生活两周
C.禁盆浴两周
D.腹痛、发热随诊
E. * * 出血超过月经量随诊
—I wonder _______ like to be an astronaut (宇航员).
—I don't know, but I imagine it's exciting. [ ]
A. what is it
B. what it is
C. whether is it
D. whether it is
