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【单选题】

端子箱内加热器与各元件、电缆及电线的距离应大于()

A.
30mm
B.
40mm
C.
50mm
D.
20mm
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参考答案:
参考解析:
.
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【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

【单选题】电压互感器端子箱内和保护屏内二次回路小开关或熔断器,应该:()。

A.
三相设置,保护屏内的小开关设置在切换回路之前
B.
三相设置,保护屏内的小开关设置在切换回路之后
C.
分相设置,保护屏内的小开关设置在切换回路之前
D.
分相设置,保护屏内的小开关设置在切换回路之后

【多选题】⾼压加热器分为()

A.
混合式
B.
表⾯式
C.
对流式
D.
逆流式