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【判断题】
直接强度调制只能用于半导体激光器LD,不能用于LED。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】M: Should we go out or eat in tonight? W: I am too tired to do any cooking. What does the woman mean?
A.
She is not hungry.
B.
She wants to cook.
C.
She is not tired.
D.
She wants to dine out.
【简答题】上图中, I s1 =1A, I s 2 =4A, I s 3 =7V,则 I s = I s1 + I s 2 + I s 3 =( )A。
【单选题】某台CT的空间分辨力为0.25mm,如用LP/cm表示,应为
A.
10LP/cm
B.
15LP/cm
C.
20LP/cm
D.
24LP/cm
E.
30LP/cm
【单选题】听力原文：W: Are you OK? You look really tired. M: I am. I cant seem to sleep at night. Ive been under a lot of pressure lately. W: Whats up? M: Ive got a million things to do. Im busy at work. Im working ...
A.
Learn to meditate or learn yoga.
B.
Walk to the supermarkets.
C.
Go mountain-climbing once a week.
D.
Take part in a bicycle race.
【简答题】9月20电商资源体验和简单站建设
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