弹簧管压力表量程偏大时则应()。
A、逆时针转动机芯;
B、顺时针转动机芯;
C、将示值调整螺钉向外移;
D、将示值调整螺钉向内移。
参考答案:D
----Mum, can I do the homework tomorrow? ------You _______finish it today.
A.had better
B.had rather
C.had better don’t
D.had rather not
预防地下铁道交通系统灾害应做到哪几条?