判断题

脚手架最常用的是门式脚手架。

答案：错误

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In the sentence "The doctor is going to examine the patient again although he did just now examine the patient", "examine the patient" after "just now" can be left out for brevity.
A、正确
B、错误

答案：正确

单项选择题

Mg2+对限制性核酸内切酶的活性非常重要。 A. 对 B. 错