试题与答案

改变牵引电动机的转速有()方法。 A.1种 B.2种 C.3种 D.4种

题型:单项选择题

题目:

改变牵引电动机的转速有()方法。

A.1种

B.2种

C.3种

D.4种

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:口腔癌无瘤手术原则要求整块切除癌肿【考点提示】恶性肿瘤无瘤操作原则

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