3311E矿用汽车制动系统调压阀可向后制动管路提供50psi的剩余压力。
参考答案:对
.It is said that a wooden bridge_________ over the river in the mountain village soon.
A.build
B.will be built
C.will build
D.built
船舶消防演习中,()施放警报解除信号,宣布演习结束,清理现场,器材归位。
A.船长
B.轮机长
C.大副