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【简答题】
铰接桁架,由竖杆AB和斜杆BC组成,两杆均为弯曲刚度为EI的细长杆,在节点B处承受水平力F作用。 (1)设 ,试确定水平力F的最大值(用 、 表示)。 (2)保持斜杆BC的长度不变,确定充分发挥两杆承载能力的 角。
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举一反三
【单选题】Which of the following statements is NOT true?
A.
Sinn Fein is a legal political party in Northern Ireland
B.
Those who want to unite Northern Ireland are called Unionist
C.
The Social Democratic and Labour Party is a very important political party in Britain
D.
Those who show their loyalty to the British Crown are called Loyalists.
【简答题】中国的动画电影诞生于什么时间?
【单选题】Which is the largest component of GDP?
A.
consumption
B.
investment
C.
government purchases
D.
net exports
【单选题】Which is optional on the envelop?
A.
Stamp.
B.
Receiver's address.
C.
Sender's address.
D.
Remarks.
【简答题】一系统需要高压动力源,用哪种动力元件合适____A、叶片泵 B、空气压缩机 C、轴向柱塞泵 D、齿轮泵
【单选题】Which of the following statements is FAULSE?_____________.
A.
The students easily become nearsighted because their books
B.
The white paper is harmful to students’ eyes.
C.
Students often use white paper in their books.
D.
Yellow paper is much better to the eyes of students who may do reading or writing for hours .
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