【简答题】某企业在生产甲、乙两种节能产品时需用A、B两种原料,生产每吨节能产品所需原料的数量如下表所示,销售甲、乙两种产品的利润m(万元)与销售量n(吨)之间的函数关系如图所示,已知该企业生产了甲种产品x吨和乙种产品y吨,共用去A原料200吨。 (1)写出x与y满足的关系式; (2)为保证生产的这批甲种、乙种产品售后的总利润不少于220万元,那么至少要用B原料多少吨?
【单选题】Tom is not late, ____?
【单选题】某靶式流量计的输出为25%时,流量为( )
【单选题】Being late at a meeting is of Tom, so you should not be surprised at his today's late arrival. [ ]
【单选题】《红楼梦启示录》在“大观园的窝里斗”一节中曾评论道,王熙凤因没“搞好婆媳关系“,导致邢夫人对她颇有微词,甚至后面”四面楚歌“,71回中的”嫌隙人“指的是谁?
【简答题】根据以下图片提示及上下文,完成对话。 Tom: Hurry up, Nancy! We're late for school! Nancy: OK, OK! ____1_____ Tom: It's 8 o'clock. Helen: Hi, there! _____2_____ Nancy: Yes, we are in a hurry. We're both late for school. ...
【简答题】1) 补全下列反意疑问句 1. You are late, _________? 2. He often reads books, _________? 3. Tom is not late, _________?