观察图中神经刺激器，请问有关神经刺激器的描述，哪项错误（）

搜题请搜索小程序“爱下问搜题”

问题单项选择题

A.是一个脉冲发生器

B.产生刺激的波形为正弦波

C.频率都相同

D.可产生不同的刺激方式

E.用于机体不同部位神经的刺激

答案

参考答案：B

句型转换

按要求完成句子(每空1分．共10分)。

小题1:There's something to eat in the cupboard.(改为一般疑问句)

__________ there__________ to eat in the cupboard?

小题2:She has hardly had anything this morning, ________ ________ ?（改为反意疑问句）

小题3:She does the housework every day.

She ________ __________ the housework every day.（改为否定句）

小题4:He was playing basketball at four yesterday afternoon. (对划线部分提问)

What _______ he__________ at four yesterday afternoon?

小题5:It is great fun to have a picnic on the hillside.(改为感叹句)

__________ _________it is to have a picnic on the hillside.

问答题

用400字以内的篇幅分析造成给定材料中(除第4—8段材料以外)所反映的主要问题的原因。