【单选题】传统干扰电疗法时起治疗作用的电流是()
A.
4000Hz与4000±100Hz的两组中频电流
C.
4000Hz与4000±100Hz的两组中频电流交叉处所形成的0~100Hz低频调制的中频电流
D.
被波宽为6s的三角波所调制的0~100Hz低频调制中频电流
E.
三组5000Hz中频电流交叉处互相干扰调制而形成的干扰电流
【单选题】What does the man say about the product?
A.
It is not as good as what the ad says.
B.
He does not believe it is good for everyone.
C.
It is better than what the ad says.
D.
It is good to believe ads.
【判断题】细胞核遗传与细胞质遗传因有共同的遗传物质基础,因而其遗传动态是符合孟德尔遗传规律的。
【单选题】What does the speaker recommend?
A.
Helping with the inventory
B.
Ordering a different product
C.
Waiting longer for the items
【单选题】What percentage does rubber industry account for in the Gross National Product in Malaysia?
【简答题】What kind of product does the addresser deal with? ______products.