长江和黄河的干流都流经的省区是:[ ]
A.贵州、四川
B.青海、四川
C.青海、甘肃
D.四川、云南
答案:B
—Dad,can we go to the shop?I want to buy some sweets.
—________.Can’t you see I’m busy at the moment?
A.Take it easy
B.No problem
C.Forget it
D.Go ahead
当需要多刀加工时,就要考虑()。当设定()时应考虑在换刀时,刀具()。