轴承一般可分为哪两大类？
参考答案：滚动轴承和滑动轴承。
________may be，one sometimes makes mistakes.[ ]
A．However a wise person
B．What a wise person
C．However wise a person
D．What wise a person
易潮解的药物可使胶囊壳（）
A.变软
B.变大
C.干燥变脆
D.变味
E.变色
