问题
单项选择题
熔丝的额定电流是指（）。
A.熔丝2min内熔断所需电流
B.熔丝正常工作时允许通过的最大电流
C.熔丝1min内熔断所需电流
D.熔丝1s内熔断所需电流
答案
参考答案：B
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熔丝的额定电流是指（）。
A.熔丝2min内熔断所需电流
B.熔丝正常工作时允许通过的最大电流
C.熔丝1min内熔断所需电流
D.熔丝1s内熔断所需电流
参考答案：B
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(1)
A．too
B．so
C．very
D．much