不定项选择

一对内、外螺纹要旋合在一起，它们的旋向可以不同。

A．正确
B．错误

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单项选择题
Credibility of the sources could be evaluated by asking questions except __________
A、Is the information credible?
B、Is the information useful/relevant?
C、Are the opinions in your sources popularly accepted?

D、Are your sources till current?
单项选择题
Complete the following sentences with the words or phrases given below. Change the form if necessary.

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