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【判断题】
正项级数收敛的充分必要条件是它的部分和数列无界。A.
正确
B.
错误
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】以下不属无性系选育优点的是( )
A.
综合利用加性与非加性遗传效应，遗传增益较高。
B.
无性系性状整齐一致，便于集约化栽培和管理。
C.
无性系选育的改良周期比较短。
D.
无性系选育可以创造更多的变异以供选择。
【多选题】以下叙述正确的是( )
A.
任意若尔当曲线具有连续转动的切线
B.
直线分复平面为两个半平面区域,这个直线是它们的公共边界
C.
若复变函数 沿点集E在点 有极限,则其和、差、积、商(分母极限不为零)沿点集E在点 仍然有极限
D.
任意复变函数 ,对定义域中每个复数 ,有且仅有一个复数 与之对应.
【单选题】I decide to pay a visit to you, but I don’t know whether it is quite _________ to you.
A.
convenient
B.
fair
C.
easy
D.
comfortable
【单选题】I ______ ten minutes to decide whether I should reject the offer.
A.
gave
B.
was given
C.
was giving
D.
had given
【单选题】I ______ ten minutes to decide whether I should accept the offer or not.
A.
gave
B.
was given
C.
was giving
D.
had given
【单选题】—Lucy,do you prepare for your trip? —No, I don’t. I will ____ the best way to have our trip.
A.
decide on
B.
decide
C.
decide to
D.
decide in
【简答题】句型转换. 1. I can't decide which one I should buy.(改为简单句) I can't decide which one _____ _____. 2. I think the school uniform are very nice . (就划线部分提问) _____ _____ you think about the school uniform? 3. ...
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