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【简答题】
麦芽α-淀粉酶的最佳作用温度是[填空(1)]℃。 A. 72～75
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【简答题】The dog plays outside. The dog is friendly.
【判断题】The IUPAC name of an alkene is derived from the name of the longest chain of carbon atoms that contains the double bond.
A.
正确
B.
错误
【简答题】Tom and Ann have a dog and a cat. The dog is Tom’s. It’s black. Its name is Peter. The cat is Ann’s. Its name is Gunder. Tom and Ann are playing with their dog and cat in the room. They put two boxes ...
【单选题】铝、镁及其合金采用直流钨极氩弧焊时,不应该将钨极接在电源的正极上,其原因是()。
A.
避免钨极损耗过大
B.
容易产生气孔
C.
工件表面没有“阴极破碎”作用
D.
飞溅大
【简答题】Lucy has a dog. Dad gives the dog to her as a birthday present. She likes it very much. The dog is only five months old now. It is very cute and beautiful. Its color is white and its eyes are brown. T...
【简答题】什么是微格教学?有哪些特点?
【简答题】Give an IUPAC substitutive name for each of the following alcohols:
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