预授权类交易只有进行()操作,特约商户才能收到交易款项。
A、预授权
B、预授权撤销
C、预授权完成
D、预授权完成撤销
参考答案:C
—Do you know the girl ______ is playing the guitar?
—Yes, she is Jack's sister. [ ]
A. whom
B. which
C. who
D. what
石油产品的水份存在形式有()、()、溶解状。