我
- A.(-)(+)(+)
- B.(-)(-)(+)
- C.(+)(-)(-)
- D.(+)(-)(+)
- A.RB=0
- B.RB=M/a
- C.RB=M/2a
- D.RB=M
- A.可动铰支座
- B.固定铰支座
- C.定向可动支座
- D.固定支座
- A. <img src="//img1.yqda.net/question-name/a1/23d88b3a601bbe974104362f1f79c5.png" width="224" height="27"/>
- B. <img src="//img1.yqda.net/question-name/55/388b9e0318e303ef2dc1a42c0d0b8a.png" width="207" height="27"/>
- C. <img src="//img1.yqda.net/question-name/c3/ac21a032da62006fca7b2c1b56f3ff.png" width="179" height="27"/>
- D. <img src="//img1.yqda.net/question-name/b6/883eaec35f7dc901e54f2e1c20fba8.png" width="159" height="24"/>
- A.P
- B.2P
- C.3P
- D.4P
- A.拉力P/2
- B.压力P/2
- C.拉力P
- D.压力P
- A.Nb=0
- B.Nb=P/2
- C.Nb=P
- D.Nb=√2P
- A.Ⅰ、Ⅲ
- B.Ⅱ、Ⅲ
- C.Ⅰ、Ⅳ
- D.Ⅱ、Ⅳ
- A.上弦杆受压且其轴力随桁架高度h增大而减小
- B.下弦杆受拉且其轴力随桁架高度h增大而减小
- C.斜腹杆受拉且其轴力随桁架高度h增大而减小
- D.竖腹杆受压且其轴力随桁架高度h增大而减小
- A.RA=RB=1/2P
- B.RA=RB=√2P
- C.RA=RB=√2/2P
- D.RA=RB=√2/4P
