题目内容

NB/T47013.4-2015标准对磁粉检测油载液要求的粘度指标主要是考虑其流动性,高闪点指标主要是考虑其安全性,无荧光是为了保证荧光磁粉检测时不致干扰正常显示。

A. 对
B. 错

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NB/T47013.4-2015标准规定的水断试验,主要是用来检验水磁悬液对被检表面的润湿性能,只有出现裸露的“水断”表面,才可以开始磁粉检测。

A. 对
B. 错

This is Ted’s phone. We miss him a lot. He ___ trying to save a child in the earthquake.

A. killed
B. is killed
C. was killed
D. was killing

---- Have you moved into the new house?---- Not yet, the rooms _____.

A. are being painted
B. are painting
C.are painted
D. are being painting

When and where to go for the on-salary holiday ___ yet.

A. are not decided
B. have not been decided
C. is not being decided
D. has not been decided