一堆胡萝卜有47个,让小兔子拿了7个,还剩多少个?
47-7= 40(个)
— I'd like to take a chance and run a factory.
— Do you know about the local market? _____. [ ]
A. No problem
B. Better safe than sorry
C. Do as you please
D. Think nothing of it
氯气离心式压缩机采用()这类轴承具有安全可靠、运行稳定、抗震性好、使用寿命长等优点。
A.静压轴承
B.动压轴承
C.滑动轴承
D.滚动轴承