供给X线管的能量，有百分之多少转换成X线 A．小于1% B．4% C．10% D_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

供给X线管的能量，有百分之多少转换成X线

A．小于1%
B．4%
C．10%
D．85%
E．99%

答案

参考答案：A

选择题

I've worked with children before so I know what _____ in my new job.

A. expected
B. to expect
C. to be expecting
D. expects

选择题

－What’s your telephone number?

－___________ 278－106.

A．I’m

B．It

C．It’s

D．Is it