“起重机前进”的专用手势信号是:双手臂先向前伸,小臂曲起,五指并拢,手心对着(),做前后运动。
A、自己
B、起重机
参考答案:A
—How’s now?
--I hear the company ______ him a very good job, but he turned it down.
A.donated
B.served
C.offered
D.introduced
建筑物中楼板附加层主要满足()作用。
A.隔声
B.承重
C.防水
D.保温
E.隔热