题目内容

Linda does not know much about theproducts and their prices.

A. 对
B. 错

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They are going to conduct a market surveyfor the new products.

A. 对
B. 错

Mr. Wood didn’t receive any professionaltraining.

A. 对
B. 错

About 13% people were satisfied with theperformance of the products.

A. 对
B. 错

以下不属于生物电信号的特点的是_________。

A. 频率低
B. 变化快
C. 幅度小
D. 噪声强