停电、送电作业应指定专人负责。禁止采用（）停电、送电。
A.按步骤操作
B.调度下令
C.提前通知
D.口头或约时
参考答案：D
We ______ to go into the school unless we are in school uniforms.[ ]
A. allow
B. are allowed
C. are not allowed
D. allowed
颅内血肿的CT值（）
A.-100～-30Hu
B.0～10Hu
C.100～200Hu
D.40～80Hu
E.-1000Hu
