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【单选题】
胎儿期保健的原则A.
避免不利因素的影响
B.
保证有利因素的影响
C.
保证有利因素的影响、避免不利因素的影响
D.
可适当的使用一些药物
E.
由于胎盘的屏障作用不会感染疾病
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反馈参考答案：
举一反三
【单选题】下列关于正弦量的说法正确的是
A.
正弦量就是用sin函数描述的电路变量
B.
正弦量就是按照正弦规律变化的电路变量
C.
正弦量是指按正弦规律变化的电流
D.
按照余弦规律变化的电压不是正弦量
【简答题】What does the South Carolina Education Network do through beauty shops?
【单选题】What does the woman suggest they do instead of paying the South Theater Company'stravel expenses?
A.
Promise long-term cooperation with the Company.
B.
Explain frankly their own current financial situation.
C.
Pay for the printing of the performance programme.
D.
Bear the cost of publicising the Company's performance.
【简答题】正弦量的三要素是指正弦量的频率、幅值和( )。
【单选题】What does the author want to tell us with the South American folktale?
A.
He just wants to tell us an interesting story.
B.
Hummingbird is small but also can make its contribution to putting out the conflagration.
C.
We should try our best to do what we can to protect the local environment and culture during our journey, and our efforts multiplied will make a difference.
D.
Hummingbird is ridiculous to try to put out the conflagration, so is an individual who tries to check the rising temperatures.
【单选题】What does the speaker say about the South American exhibition?
A.
It' s popular among children.
B.
It' s closed for cleaning.
C.
Lions and tigers are the features.
D.
It' s most recently built.
【单选题】What does the woman think of the journey to South America?
A.
Exciting.
B.
Dangerous.
C.
Expensive.
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