【单选题】Fire hose couplings().
A.
are made of bronze,brass,or soft alloy metals
B.
should be painted red in order to identify hose lengths
C.
are specially hardened to prevent crushing
D.
should be greased frequently
【单选题】--- A: W hose pen is it? --- B: Let me see. _________________________.
【单选题】The canvas covering of fire hose is called the().
【多选题】麦弗逊独立悬架车辆,当减震器由于事故变弯,可能会导致
【单选题】创建宏时至少要定义一个宏操作,并要设置对应的( )。