在职业接触限值中，最高容许浓度表示为（）。
A.OEL
B.PC-TWA
C.MAC
D.PC-STEL
E.WBTG
参考答案：C
I don’t understand why the boss should __________ the girl, because in my opinion, it was her fault that caused the loss.
A．make out
B．leave out
C．let out
D．put out
圆的半径由3厘米增加到5厘米，圆的周长增加了6.28厘米。[ ]
