可调放气活门作动器有（）。
A.1个
B.2个
C.3个
D.12个
参考答案：B
Looking at her _______ looks，we were _______.
A．astonished；confused
B．astonishing；confusing
C．astonishment；confused
D．astonished；confusing
G6010锯床最大切割尺寸圆坯是（）。
