VE70小风机输出的空气压力大约为（）mbar。
A.10
B.60
C.80
D.100
参考答案：A
The workers agreed to ________ the strike if the company would satisfy their demands.
A．call for
B．call in
C．call off
D．call up
挑阳台为悬臂结构，必须安全可靠，挑出长度常取( )。
A．1.2m B．1～1.5mC．0.5～1m D．1.2～1.5m
