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【单选题】
土中所含不能传递静水压力,但水膜可缓慢转移从而使土具有一定的可塑性的水,称为 。A.
毛细水
B.
重力水
C.
强结合水
D.
弱结合水
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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
【单选题】用相量表示正弦量,指的是用复数的模代表正弦量的( ),复数的辐角代表正弦量的( )
A.
最大值，初相位
B.
有效值，初相位
C.
有效值，相位差
D.
最大值，相位差
【简答题】What does the South Carolina Education Network do through beauty shops?
【简答题】回转体表面取点的方法及原理是什么?
【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 South China Tiger eat?
A.
It eats fruit and leaves.
B.
It eats other animals.
C.
It eats bamboo.
【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.
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