液压的ECAM系统页面中显示的活门符号代表哪个活门?()
A.安全活门
B.顺序活门
C.火警关断活门
D.优先活门
参考答案:C
7.-Will the little bed for the little girl?
-As far as I know ,it is just the one for her.
A.do
B.fit
C.suit
D.Match
立杆必须用连墙件与建筑物可靠连接。()