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【单选题】
压杆临界力的大小与( )无关。A.
压杆所承受的轴向压力大小
B.
压杆的长度
C.
压杆材料
D.
压杆的横截面形状和尺寸
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举一反三
【单选题】级数前几项和s n =a 1 +a 2 +…+a n ，若a n ≥0，判断数列｛s n ｝有界是级数 a n 收敛的什么条件（）？
A.
充分条件，但非必要条件
B.
必要条件，但非充分条件
C.
充分必要条件
D.
既非充分条件，又非必要条件
【简答题】形体锻炼是以________为基础,通过各种身体练习,达到_______、________、________缓解压力,娱乐身心的一项健身运动。形体是指人体结构的外在表现,具体讲就是________。
【单选题】A live program on TV is calling on people to ______ money or some other things to the people who have suffered from the earthquake in Qinghai Province.
A.
donate
B.
lend
C.
put
D.
pay
【单选题】A live program on TV is calling on people to ______ money or some other things to the people who have suffered from the flood in Henan Province.
A.
donate
B.
lend
C.
put
D.
pay
【单选题】If you hav e , you have the ability to decide what to do next and to do it, without needing other people to tell you what to do .
A.
globalization
B.
gratitude
C.
obligation
D.
initiative
【单选题】— I didn’t care about what other people thought about me. — Well, you ________.
A.
should
B.
ought to have
C.
would have
D.
could
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