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举一反三
【单选题】第17题 My brother brought me a few reference books, but ________ of them was of any use for my report.
A.
neither
B.
none
C.
either
D.
all
【单选题】Man: How are things going with your grandmother?Woman: Some days at my brother's have brought the roses to her cheeks.Question: What does the woman mean?
A.
Her brother didn't take good care of her grandmother.
B.
Her grandmother looks very healthy after some days at her brother's.
C.
Her grandmother looks very tired after some days at her brother's.
D.
Her brother has made her grandmother very happy by often buying her roses.
【简答题】按颗粒尺寸进行物质分类,可将水体中污染物分为____、____和____。
【简答题】要造一圆柱形油罐，体积为V，问底半径r和高h各等于多少时才能使表面积最小？这时底直径与高的比是多少？
【简答题】某中间商一年需要A公司的电视机5000台,每台2000元,每次订购处理成本400 元,每年的占用成本占单位成本0.2%,试求该产品的最佳订购量。
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