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问答题

The night market only opens at night.
The nightclub closes before midnight.
The park is not very crowded before seven o’clock.

单项选择题

以下哪一知识部分需要在人体上充分操作练习？
A、身体评估
B、常用实验室检查
C、常用心电图检查
D、护理诊断