蜗杆的全齿高的计算公式为：h=( )。
A．2.2mx
B．2m
C．1.2mx
D．mx
参考答案：A
－Would you like to join us in the game?
－________, for I have something important to do.
A．I will
B．I’d love to
C．I won’t
D．I’m afraid not
廉洁奉公这一道德规范，要求公务员做到艰苦朴素。（）
