楼长和副楼长的考评由管委会、楼管会、物业和学生依据学生干部工作职责按()的比例进行评定?
A、5:4:3:2
B、4:3:2:1
C、5:4::2:1
D、5:3:2:1
参考答案:D
发电机充氢时,密封油系统必须连续运行,并保持密封油压与氢压差值,排烟风机也必须()。
I saw her while l was shopping.
I saw her _____ _____.