转向机构可以根据摩托车行驶的需要使摩托车（）形式方向。
A.保持直线
B.改变
C.自动控制
D.保持曲线
参考答案：B
某厂一台300MW机组，4月份C级检修20天。期间，引风机计划检修10天，该引风机当月计划检修系数是（）。
A、33.33%
B、66.67%
C、100%
D、0
The meeting was concerned _____reforms and everyone present was concerned _____their own
interests. [ ]
A. about; with
B. with; by
C. for; about
D. with; about
