一般精度的车床主轴承，其间隙的（）mm。
A.0.015～0.03
B.0.004～0.07
C.0.07～0.075
D.0.03～0.04
参考答案：A
—Could you please tell me _____________?
--“Rome wasn’t built in a day”. You should try to give it enough chances to become strong.
A．why I should do to have a good memory
B．what I can do to have a good memory
C．how can I do to have a good memory
D．what can I do to have a good memory
一、二星级饭店客房配备的信纸便笺，纸质不低于（）。
A.30克
B.50克
C.60克
D.70克
