随着运行小时的增加，引风机震动逐渐增大的主要原因一般是（）。
A、轴承磨损
B、进风不正常
C、风机叶轮磨损
D、出风不正常
参考答案：C
I'm sorry I didn't recognize you just now. You look different _____. [ ]
A. somewhat
B. somehow
C. anyhow
D. anyway
Take your time! We have _____time left. [ ]
A. little
B. few
C. a little
D. a few
