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【单选题】
单向半波可控整流电路,变压器次级电压为20V,则整流二极管实际承受的最高反向电压为( )。A.
20V
B.
20 √ 2 V
C.
18V
D.
9V
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【简答题】化学专业词汇汉译英:氧化还原反应
【单选题】What does paragraph 3 mainly talk about? 查看材料
A.
Different effects of caffeinated coffee and decaf on sleep.
B.
Different findings of Lotan Shilo and ateam about caffeine.
C.
The fact that the subjects slept 415 tninutes per night after drinking decaf.
D.
The proof that the subjects took half an hour to fall asleep.
【简答题】What does Paragraph 3 mainly tell us? (No more than 10 words)
【简答题】What does Paragraph 3 predict ?