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【单选题】
______年,北美第一家种子公司在费城建立,经营菜豆、包心菜等蔬菜种子。
【单选题】
以下哪个概念用以表示种子的杂质含量多少
【单选题】
10万粒种子有1万粒不发芽,今从中任取100粒,则至少有80粒发芽的概率是()
【判断题】
有甲乙两批种子,发芽率分别为0.8和0.7,在两批种子中各任意选取一粒,则至少有一粒种子发芽的概率为0.06.
【判断题】
有甲乙两批种子,发芽率分别为0.8和0.7,在两批种子中各任意选取一粒,则至少有一粒种子发芽的概率为0.94.
【判断题】
有甲乙两批种子,发芽率分别为0.8和0.7,在两批种子中各任意选取一粒,则这两粒种子都能发芽的概率为0.56.
【单选题】
I fell and hurt myself while I ________ basketball yesterday.
【单选题】
When father was young, he ______from morning till night.
【单选题】
A pair of spectacles ________ what I need at the moment.
【单选题】
Well go for a picnic if it ________tomorrow.
【单选题】
He asked the waiter ________ the bill.
【单选题】
I forgot to return the book to you yesterday. So I _____________today.
【单选题】
She wonders ____will happen to her private life in the future.
【单选题】
What ___the population of the USA?
【单选题】
Tom is so talkative. Im sure youll soon get tired _______ him.
【单选题】
Its reported that a new hospital _____________here next year.