单向流洁净室风速测试时截面上测点间距不应大于1m,测点数不少于()个,均匀布置。
A.10
B.5
C.15
D.20
参考答案:D
Encourage your children to reach a(n) ________ between what he wants and what you want.[ ]
A. achievement
B. appointment
C. compromise
D. adaptation
ADC288青色效果不均匀,可能是由什么造成的()
A.转印带
B.激光单元
C.鼓组建
D.显影