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【简答题】
动植物体内含量为 的元素为常量元素,含量为 的元素为微量元素。
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【单选题】His wife was wearing a hat. She _____ . (a)was dressing it (b)was putting it on (c)had it on (d)was carving it
A.
was dressing it
B.
was putting it on
C.
had it on
D.
was carving it
【简答题】某4变量逻辑函数的卡诺图中有9个1，化简成最简与或表达式后，最多有 （请填数字）个与项。
【简答题】什么是基因载体?试举一二例常用的基因载体。
【简答题】阅读理解。 Mrs. Black is sixty-nine years old. She only has a daughter named Sandra. Mr. Black died twelve years ago. Mrs. Black was very sad and lived in her house alone. Two years ago her daughter had a ...
【简答题】某4变量逻辑函数的卡诺图中有9个1，化简成最简与或表达式后，最少有 （请填数字）个与项。
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