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We？need to？ensure？the？credibility？of the？market()

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Freshmen will fall in love with college life after they are used to living in the new

If it will be sunny, we will go hiking.()

螺纹有五个基本要素，它们是：（）

A. 牙型、公称直径、螺距、线数和旋向
B. 牙型、直径、螺距、旋向和旋合长度
C. 牙型、公称直径、螺距、导程和线数
D. 牙型、直径、螺距、线数和旋向

If he were free, he would help us.()