乳腺常规检查技术()
A．高千伏摄片
B．双重造影
C．连续摄片
D．纸包片摄片
E．软组织摄片
参考答案：E
—We'd better hurry; we'll be late.
— __________. Do you really want to listen to the boring lecture?
A．For what?
B．Take it easy.
C．What on?
D．So what?
气体灭火系统设计中，一个组合分配系统所保护的防护区不应超过（）个。
A．4
B．6
C．8
D．10
