问题
选择题
He was ____ to the sales division of the business by his new firm. [ ]
A. devoted
B. appealed
C. attached
D. owed
答案
答案：C
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He was ____ to the sales division of the business by his new firm. [ ]
A. devoted
B. appealed
C. attached
D. owed
答案：C
，摩尔质量为M，则阿伏加德罗常数的表达式为_____________。