题目内容

Cet-4-1.1-Exercise 01In a ______ of 14 studies that looked at physical activity and academic performance, investigators found that the more children moved, the better their grades were in school.

A. commitment
B. observing
C. review

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Cet-4-1.1-Exercise 02Immigrant parents could talk about their country of ______ and why they emigrated to the United States.

A. origin
B. provoke
C. deals

表面粗糙度的最常用的评定指标是 RS m 。

A. 对
B. 错

RSm 和 Rmr(c) 是附加参数，不能单独使用，需与幅度参数联合使用。

A. 对
B. 错

需要涂镀或其它有细密度要求的表面可加选 Rz 。

A. 对
B. 错