荧光磁粉比非荧光磁粉的优越之处在于（）。
A.更适合于野外现场探伤
B.成本低
C.可提高对细小缺陷的识别能力
D.最适用于干法
参考答案：C
I can hardly hear what it is saying on TV. Would you please ________?
A．turn it up
B．turn it down
C．turn it off
D．turn it on
南面官、北面官
