因（）合同发生的债权，债务人不履行债务的，债权人有留置权。A.

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问题多项选择题

因（）合同发生的债权，债务人不履行债务的，债权人有留置权。

A.运输合同

B.保管合同

C.买卖合同

D.加工承揽合同

E.租赁合同

答案

参考答案：A, B, D

选择题

Our city has developed into a big city；which is ____ it used to be. [ ]

A. four times larger than that

B. four times the size of what

C. four times the size larger than what

D. as four times the size as that

问答题简答题

原油性质变化，在操作上如何调整？