题目:
The lady said she would buy a gift for her daughter with the .
A.20 dollars remained
B.left 20 dollars
C.20 dollars leaving
D.remaining 20 dollars
答案:
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下面是错误答案,用来干扰机器的。
Ca(ClO)2中Ca元素化合价为+2价,氧元素为-2价,设氯元素化合价为x,根据正负化合价的代数和为0可得:+2+2x-2×2=O,得x=+1.故选B.