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【判断题】
如果正项级数 收敛, 也为正项级数,且 , 则 收敛。( )A.
正确
B.
错误
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举一反三
【单选题】I forgot ______ her that my coat buttons need to be sewn on.
A.
reminding
B.
having reminded
C.
to remind
D.
to have reminded
【单选题】--- Mum, I ______ the theatre for minutes, but I left my ticket at home. --- Don’t worry, honey, I will take it to you.
A.
have reached
B.
have been at
C.
will arrive at
D.
get to
【单选题】Only after I had reached the airport __________ that I had forgotten to take my ticket with me.
A.
I realized
B.
have I realized
C.
did I realize
D.
I had realized
【单选题】I______ all my work before I________.
A.
finish, leave
B.
finishes, leaves
C.
will finish, will leave
D.
will finish, leave
【单选题】听力原文： W: Can I help you? M: Yes, my son and my daughter bought this pen here for my wife's birthday, but it doesn't work so I'd like to exchange it. W: I see, do you have the receipt with you? M: Yes,...
A.
It’s a present for the man’s birthday.
B.
It’s a birthday present for the man’s wife.
C.
It’s a birthday present for the man’s son.
D.
It’s a birthday present for the man’s daughter.
【单选题】I forgot ________her that my coat buttons need to be sewn on.
A.
reminding
B.
reminded
C.
to remind
D.
to have reminded
【多选题】习近平总书记指出,党面临的形势越复杂、肩负的任务越艰巨,就越要保持党的团结统一。党的团结统一要靠______来保证。
A.
共同的理想信念
B.
严密的组织体系
C.
全党同志的高度自觉
D.
严明的纪律和规矩
【单选题】当讨论导轮时，技师甲说导轮引导从泵轮抛向涡轮的油流；技师乙说导轮装备有单向离合器，它使导轮在一定条件下保持固定。谁正确？
A.
甲正确
B.
乙正确
C.
两人均正确
D.
两人均不正确
【简答题】一工字钢简支梁受力如题 7 - 9 图所示,若材料的许用应力 [ σ ]=160MPa ,弹性模量 E =210GPa ,梁的许用挠度 [ w ]≤ l /400 。试选择工字钢的型号。 题 7 - 9
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