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单项选择题

表皮在皮肤的表层，由角化的复层扁平上皮构成。由（ ）、（ ）和（ ）构成。

A、棘化层
B、角化层
C、颗粒层
D、生发层
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桥式整流电路，输入交流电压的有效值为10V，则输出直流电压约为（ ）。
单项选择题
中国古代记载的白天都能看见的“天关客星”，就是什么天象？
A、红巨星闪耀
B、白矮星坍塌
C、流星划过夜空
D、超新星爆发
单项选择题
You’re going to make a presentation about people’s increasing reliance on mobile phone. Which of the following is NOT appropriate to be used to grab audience’s attention in the opening of a presentation?
A、You open with a quotation: "If television is a babysitter, the Internet is a drunk librarian who won’t shut up".
B、You ask audience to imagine what if they live without mobile phone for two days.
C、You display a picture in which all the people are playing with mobile phones on a subway car.
D、You open with a question: “Could you tell me how often you update your We-chat Moments?”
A.
B.
C.
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