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【判断题】
与一个投影面垂直的直线,一定与其他两个投影面平行,这样的直线称为投影面的垂直线。A.
正确
B.
错误
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知识点：
皮皮学刷刷变学霸
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】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.
【单选题】What does the man and the woman say about people in South America?
A.
They get stressed because they are always late.
B.
They are not very time-conscious and are often late.
C.
They are always late because life has too much stress.
D.
They have a habit of being different and kind.
【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 author mean by saying 'Connectivity has yet to make a romantic South Seas sun set less special to us ' ( Line 3 , Para 2)1
A.
Being linked to the outside world does not make our adventure less romantic
B.
Being linked to the outside world, we feel Jess romantic watching the sunset on the South Seas
C.
Being connected with the outside world helps to make our journey more romantic
D.
Connectivity saves us the trouble of going to the South Seas to enjoy a romantic sunset
【单选题】What does the woman think of the journey to South America?
A.
Exciting.
B.
Dangerous.
C.
Expensive.
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