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【单选题】
111年前—1909年9月21日,旅美华侨( )在美国设计制造了中国人zhi的第一架飞机,并亲自驾驶它飞上了蓝天,实现了中国人的首次载人动力飞行。A.
B.
C.
D.
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举一反三
【单选题】同分异构现象在有机化合物中是非常普遍的。下列各组化合物中互为同分异构体的是 ①CH 3 CH 2 CH 2 CH 3 和(CH 3 ) 2 CHCH 3 ； ②CH 3 CH 2 OH和CH 3 CH 2 CH 2 OH； ③CH 3 COOCH 2 CH 3 和CH 3 CH 2 CH 2 COOH； ④CH 3 CH=CHCH 3 和CH 3 CH 2 CH=CH 2 ； ⑤ ...
A.
①②④
B.
①③⑤
C.
①③④⑤
D.
①③④
【简答题】高血压:成人在休息安静状态下,动脉的 ≥ 140mmHg 、 ≥ 90mmHg 为高血压。
【多选题】Which ones of the following expessions coud you use before paraphrasing others' meaning?
A.
So, what you are saying is that.
B.
If i'm hearing you correctly， you mean.
C.
To put it another way, you mean.
D.
In other words.
【多选题】Which ones of the following expressions could you use before paraphrasing others' meanings?
A.
So, what you are saying is that...
B.
If I'm hearing you correctly, you mean...
C.
To put it another way, you mean...
D.
In other words,...
【单选题】Man: Can you come over for dinner tonight? Woman: I'm up to my ears in work, so I'll have to take a rain check. Question: What does the woman mean?
A.
She wants to check the weather before deciding.
B.
She has a problem with her hearing.
C.
She'd enjoy coming to dinner another time.
D.
She wants the man to help her with some work.
【简答题】端电压恒为 ,与流过它的电流 i 无关的二端元件称为
【简答题】端电压恒为 U ,与流过它的电流 i 无关的二端元件称为 。 输出电流恒为I ,与其端电压 u 无关的二端元件称为 。
【单选题】E-mail From: Megan Campbell To: Marta Apter Marta: I'm sorry I didn't respond to your e-mail earlier. I had a problem with my e-mail system for a few days, and I wasn't able to retrieve new messages. ...
A.
To apologize to Marta for not finishing an assignment
B.
To tell Marta she will accept an assignment
C.
To tell Marta she will be unable to complete an assignment on time
D.
To explain to Marta her problems with an assignment
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