单项选择题

DCEP在上海试点的时间是在（）

A.2020年11月
B.2020年12月
C.2021年1月
D.2021年2月

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单项选择题

If Hitler invaded Hell I would make at least a favorable reference to the Devil in the House of Commons. "Reference" has the same meaning as:
A、Please keep this sheet in a safe place for reference.
B、He made no reference to any agreement.
C、The official at the American embassy asked me for two references.
D、The firm offered to give a reference.

喷流传播的基本问题是磁场问题。
正确
错误

答案：错误