题型:问答题 看医生。( )1. This is a English book. A B C D( )2. — What's this? — It’s clock. A B C D( )3. This's an apple. That is a pear. A B C D( )4. What's that at English? A B C D( )5. — Is this your book? — No, it’s no. A B C D 查看答案
题型:问答题 某羊皮手套生产厂计划投入适当的广告费,对生产的手套进行促销.在一年内,据测算销售量S(万双)与广告费x(万元)之间的函数关系是S=5-2x.已知羊皮手套的固定投入为6万元,每生产1万双羊皮手套仍需再投入25万元.(年销售收入=年生产成本的120%+年广告费的50%).(I)将羊皮手套的年利润L(万元)表示为年广告费x(万元)的函数;(II)当年广告费投入为多少万元时,此厂的年利润最大,最大利润为多少?(年利润=年销售收入-年生产成本-年广告费).(结果保留两位小数)(参考数据:3=1.732,5=2.236,6=2.449) 查看答案
题型:问答题 It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words. A.may B.couldn’tC.shouldD.needn’t 查看答案