负荷重冲击大的辊道应选空心辊子。
参考答案：错
We like traveling from one place to _______ to learn about different cultures around the world. [ ]
A. other
B. another
C. others
D. the others
应激反应中，较少受影响的无机盐是（）
A.镁
B.磷
C.钙
D.钾
E.钠
