下列运算中,正确的是[ ]
A.2x﹣x=1
B.x+x4=x5
C.(﹣2x)3=﹣6x3
D.x2y÷y=x2
答案:D
I would rather ______a good book than _______out to play this afternoon.It's too hot outside.
A.to read , to go
B.reading, going
C.read, go
D.to read, going
起下钻中发生溢流后,应立即停止起下钻作业,抢接回压阀,适当打开节流阀,并()。
A、向队长和钻井技术人员报告
B、不用报告
C、下钻
D、起钻