中兴组合电源系统中不同模块中（）可以带电插拔。
A.监控单元
B.整流器
C.蓄电池
D.直流配电
参考答案：B
–Do you know what Mike does all day?
–I know he spends at least as much time watching TV as he _____ his lessons.
A．is doing
B．does
C．spends in
D．does doing
蛛网膜下腔出血，针对病因诊断首选的检查是（）
A.腰椎穿刺
B.脑电图
C.经颅彩色多普勒
D.全脑血管造影
E.凝血功能检查
