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【单选题】
用万用表欧姆档测量有加热器电热丝的电阻值，没有阻值时，说明电热丝已( )。
A.
断路
B.
短路
C.
正常接通
D.
并联
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status