电气主接线的经济性主要考虑的因素为( )。
A.回收投资快;
B.总投资少;
C.占地面积小;
D.厂用电率低。
参考答案:B,C
有四个柱塞式转舵油缸的舵机,某油缸严重漏油时,应()。
A.单独停用该缸
B.停用该缸及斜对角油缸
C.停用同柱塞或同舷一对油缸
D.全部停用
— What a lovely day! Why not go swimming this afternoon? —()
A.Because it’s raining.
B.Have a good time!
C.Why do you go swimming?
D.It sounds nice