—
— I'm fine, thanks.[ ]
A. How old are you?
B. How are you?
C. Who are you?
答案:B
区别下列物质,选用的方法或试剂不正确的是[ ]
鼓风机电机轴承磨损将导致()。
(A)排出量不足
(B)鼓风机振动
(C)电机温升过高
(D)B、C正确