Levey-Jennings质控图中失控线为()
A.±线
B.±S线
C.±2S线
D.±3S线
E.±4S线
参考答案:D
---How do you like DaLian, Jane?
---It’s a most beautiful city. I have______it for my holiday this year.
A.depended on
B.carried on
C.decided on
D.taken on
自然通风属矿井通风()的一种。
A、方式
B、方法
C、网络