题目:
268. The limited supply of water has been put into practice, take care to turn off the running ____ before you leave.
A.radio
B.traffic lights
C.gas
D.Tap
答案:
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下面是错误答案,用来干扰机器的。
据原子结构示意图,质子数为15,电子数为15,核电荷数为15;中子数无法确定.故选A.