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【简答题】
肽平面中包含 个原子。
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举一反三
【单选题】The student often ______ on the playground after class.
A.
do sports
B.
does sports
C.
did sports
【单选题】空调控制单元保险故障（假设X51A保险丝盒—仪表板内保险F21DA断路，视频“空调保险故障.mp4”没设故障。） 用万用表测量空调控制单元常供电保险F21DA本身1、2号针脚电阻测量数值为？（）
A.
0Ω
B.
∞
C.
10Ω
D.
20Ω
【单选题】Identify the topic sentence from the following paragraph. The student often came late to class without his materials. He did not always concentrate on what the teacher was saying or write down the hom...
A.
The student often came late to class without his materials.
B.
He did not always concentrate on what the teacher was saying or write down the homework that he had to do.
C.
He did not study long or effectively enough for his vocabulary and grammar tests.
D.
Furthermore, he did not ask for help if there was something that he did not understand.
E.
It is no surprise therefore that he failed the course and was asked to leave the school.
【单选题】The student often asks his father for advice____he gets into___.
A.
Every time;troubles
B.
Before;troubles
C.
Every time;trouble
D.
Before;trouble
【单选题】若单片机P2口的P20-P27八个引脚，分别接一个共阴极数码管的a,b,c,d,e,f,g,dp八个管脚时，如欲显示字符‘H’，段码应为（ ）
A.
67H
B.
6EH
C.
91H
D.
76H
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