铣削一单螺旋槽工件，计算时，其导程（）螺旋线得螺距
A.大于
B.等于
C.小于
D.约等于
参考答案：B
-I' m very sorry, Allen. I can't find your favorite CD.
--_____, Torn. I'll go and buy another one. [ ]
A. It doesn't matter
B. Don't say that
C. Sure
D. You are kidding .
下列各类在用车船中，可以享受车船使用税减免税优惠政策的有( )。
A．人民团体自用的汽车
B．军队用于出租的富余车辆
C．医院自用的救护车辆
D．载重量不超过1吨的渔船
