对于能开泵循环通的井,可把浓度35%的盐酸替到水泥卡的井段,靠盐酸破坏水泥环而解卡。
参考答案:错
–This is the first time I _____ pictures with you .
–Now it is time that you ______ a picture for me .
A.took , took
B.have taken , took
C.took , have taken
D.has taken , take
玩具制造业属于________指向型工业
A.劳动力
B.原料
C.市场
D.动力