【简答题】影响学前儿童心理发展的因素有哪些?论述各因素在学前儿童心理发展中的作用。
【单选题】—There's a(n) _____ on the board saying that the meeting has been put off. —Oh, that's too bad. [ ]
【单选题】The board of directors has made an important decision that will ______ the company's future.
【简答题】某公司2016年某产品的销量为10万件,单价为400元,单位变动成本位300元,固定成本为500万元,求(1)边际贡献(2)息税前利润
【判断题】带传动中由于存在弹性滑动,因此实际传动比小于理论传动比。