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【简答题】
、无籽西瓜因高度不育而没有种子,试述其高度不育的遗传机理?
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反馈参考答案：
举一反三
【简答题】刺激;鼓舞,激励(动词)
【单选题】In the early 1930s, the American foreign policy was isolationism, but the ______ suddenly changed the whole situation, which propelled the U.S. into World War II.
A.
Pearl Harbor attack
B.
bombing of Guam island
C.
seizing of American merchant ships
D.
sinking of American passenger ships
【简答题】铅酸蓄电池的工作原理可以概括为 ;锂离子电池的工作原理是 。
【单选题】Which sentences contain “A yet B” type ?
A.
Nagasakihas always been in the shadow of Hiroshima ... Yet the bombing of Nagasaki is in certain respects the fitter symbol of the nuclear danger thatstill hangs over us. (Paragraph 2)
B.
Should it beNagasaki, intact and alive, before the bomb was dropped – or perhaps the sparedcity of Kokura?
C.
Should it be achild, or a mother and child, or perhaps the Earth itself ?
D.
None seems adequate, for how can we give a definite form to that which can assume infinite forms, namely, the lives of all human beings, now and in the future?
【判断题】砂石导渗沟内按反滤要求分层填出粗砂、小石子、大石子,滤料填筑应符合下细上粗、两侧细中间粗、上下分层排列,两侧分层包住的要求。每层后大于15cm。()
A.
正确
B.
错误
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