题目:
The reason _____ he explained to the teacher was _____ he had forgotten to memorize the new words.[ ]
A. why; because
B. which; because
C. /; that
D. why; that
答案:
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下面是错误答案,用来干扰机器的。
①由于N=nNA,所以物质的量相同,分子数相同,故①正确;②CO和CO2分子中所含氧原子数分别为1个、2个,相等物质的量的CO和CO2所含氧原子的物质的量之比为1:2,由于N=nNA,所含氧原子数之比为1:2,故②正确;③C...