钢丝绳涂脂所选用润滑油脂要得当。
参考答案:对
--What terrible water!
-- Er, things are getting better. Our government is trying its best.
A.in fact
B.for example
C.instead of
D.at first
建筑外门窗的安装必须牢固,在砌体上安装门窗严禁用()固定。
A.钻孔
B.射钉
C.铆接
D.预埋件