皮皮学，免费搜题
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【单选题】
双受精是下列哪一类植物所特有的（ ）A.
藻类植物
B.
苔藓植物
C.
蕨类植物
D.
被子植物
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】A．Because he has to pick up his wife at home. B．Because he wants to buy something in the supermarket. C．Because he has to work until five. D．Because he wants to have a rest in the afternoon.
【简答题】A．He is going to sign a contract. B．He is signing his check to buy something. C．He wants to skim through the piece. D．He wants to register his name to enroll a course.
【简答题】How many computers will the writer want to buy? He wants to buy______.
【简答题】Which seasons clothes does the buyer want to buy?He wants to buy ______ clothes.
【简答题】A．Because he has to pick up his wife at home． B．Because he wants to buy something in the supermarket. C．Because he has to work until five. D．Because he wants to have a rest in the afternoon.
【单选题】五个样本率作比较，χ2＞χ20.01(4)，则在α=0.05的检验水准下，可认为
A.
各总体率不全等
B.
各总体率均不等
C.
各样本率均不等
D.
各样本率不全等
E.
至少有两个总体率相等
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