()是企业用于防范和抵御风险,补充资本的重要资金来源。
A.未分配利润
B.利润总额
C.公积金
D.留存收益
参考答案:C
—What about playing basketball this afternoon,Tom?
—I’d rather________at home than________ football. It’s too hot outside. [ ]
A. stay; playing
B. stay; play
C. to stay; to play
D. to stay; playing
适用于大口径管道,低压差,阻力损失小,流通能力大场合应选()。
A.蝶阀
B.隔膜阀
C.偏心旋转阀
D.笼式阀