螺纹的螺距越小，则螺纹的精度越高
参考答案：错
It was in the street ______ I live that I met Mr. Green.
A．that
B．which
C．where
D．when
凸轮式刮板式流量计在转子园筒壁上沿径向开有互成（）角的四个槽
A、45°
B、60°
C、90°
D、120°
