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【单选题】
下列哪种故障会使位于空调暖水阀到加热器芯（暖水箱）的软管热，而出水软管却不热？（）
A.
空调暖水阀卡死在关闭位置
B.
节温器不合格
C.
散热器堵塞
D.
加热器芯堵塞
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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