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【判断题】
【机电-电气】一定强度的电场,磁场,电磁场都可能对人有损害。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】—Smoking is forbidden in the workshop， please stop it.rn—Sorry， I ________________.
A.
am not sure
B.
have no idea
C.
do know
D.
did not know
【单选题】You should______. It's bad for your health. [ ]
A.
stop smoking
B.
stop to smoke
C.
stopped smoking
D.
stop and smoke
【简答题】5w2h是指：_____、_____、_____、_____、_____、_____、_____、_____。
【简答题】我正要走时，电话铃响了。
【单选题】If the voltage applied across the Zener diode is ( ) its , the Zener is in the reverse cutoff region
A.
greater than
B.
equal to
C.
less than
【简答题】For the circuit shown in Figure1, the first zener diode is forward biased, and the second zener diode is reverse biased, the voltage sum of the two diode is ____
【单选题】披萨和汉堡是消费者的替代品。假设:披萨价格的上涨,____影响了汉堡的市场均衡价格,______影响了汉堡的市场均衡数量?
A.
a. 提高;增加
B.
b. 提高;减少
C.
c. 降低;增加
D.
d. 降低;减少
【单选题】The zener diode wokes in ____________ mode
A.
forword biased
B.
reverse biased
C.
reverse biased breakdown
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