四缸柴油机，各缸作功的间隔角度为（）。
A．45°
B．30°
C．120°
D．180°
参考答案：D
A．“与”门
B．“或”门
C．“非”门
D．“与非”门
If you are not familiar ____ the topic, you may write something that is familiar ____ you. [ ]
A. with; with
B. to; to
C. to; with
D. with; to
