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【简答题】
称取纯碱试样两份各1.000g溶于,先以酚酞为指示剂滴至终点,需0.2500mol·L-1HCl 20.40ml;另一份以甲基橙作指示剂继续以HCl滴定,到终点时消耗同浓度HCl 28.46ml,求试样中含有何种物质及其质量分数。
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【简答题】He bought an antique vase from the flee market.
【简答题】They talked to him for hours, (try)______to persuade him to change his mind.
【简答题】如果我们能有竞争力地——也就是以低廉的价格——把海水净化成淡水,这将有利于人类的长期利益,这一成就将使其他所有科学成就都显得渺小。
【简答题】例题 1 有一个额定值为 “ 1 kW , 220 V ” 的电暖器,正常工作时的工作电流是多大?如果由于供电紧张,电压下降到 160 V ,它的实际功率将是多少?
【单选题】That ______ antique vase was bought by a man yesterday.
A.
valueless
B.
priceless
C.
worthless
D.
pennyless
【单选题】The antique vase grandpa bought at the flea market yesterday was a forgery.
A.
man-made
B.
natural
C.
crude
D.
real
【简答题】A few days ago, my sister Liz and I talked about Dad, and we decided to get him a little something for Father's Day. We talked about the times when we were up and how Mom and Dad used to play the ‘goo...
【单选题】The antique vase grandma bought at the flea market yesterday was a _____ forgery
A.
man-made
B.
natural
C.
crude
D.
real
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