一般细菌质粒用强碱处理后存在于（）
A.液相
B.DNA
C.RNA
D.B+C
E.以上都可以
参考答案：A
Both Class 3 and our class won't be able to finish the work unless they ___ each other.
A．team up with
B．come up with
C．put up with
D．catch up with
口咽通气管仅限______和______的昏迷病人使用。
