铸铁管当工作压力大于0.5MPa时,试验压力应增加()MPa。
A、0.3
B、0.4
C、0.5
D、0.6
参考答案:C
The bush fire ________ fierce heat and the villagers nearby had to flee.
A.set up
B.sent away
C.gave off
D.made out
《铁路信号维护规则》对ZPW-2000闭环电码化轨道电路出口电流值有何要求?