受弯构件正截面承载力中，对于双筋截面，下面哪个条件可以满足受压钢筋的屈服（）。
A:
；
B:
；
C:
；
D:
；
A:
；B:
；C:
；D:
；
举一反三
- 图示结构，汇交于结点A各杆端的力矩分配系数为：（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/d8fb108baf5043489469508c124eabc9.png"> A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/71af4aae8d3c4cc3a8236715c02d8dd0.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/ccfc76583f3a4a17a1b8ae5d350c35c7.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/0f214a006bf64228879035c5c64fba2a.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6e2d4cb58c943b19e51aa37b929a34d.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/7b66a4d0913142fabfdc2805b2971ecb.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/54e6491e78754550be4f562e0849acd0.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/115a0df0ea124266ae250912e8b572a1.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/b686ba286d90499a9729e57a8fea8e32.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/5c1a3965cc7245a0a9bca5f2eae645bf.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/3b342699d2aa451d9a227dff4928c65f.png">,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/1d9ea5da536a4f18bd677cead25f28b2.png">
- 下列结论错误的是（） A: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/4a3d4acefd7f4477a8e87e2ae428b31a.png">处连续，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/091d1b1af4704a85b8293d2fd567adbf.png">处可导. B: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6a503657edf44fb88c8b115537832ae.png">处不连续，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/091d1b1af4704a85b8293d2fd567adbf.png">处不可导. C: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6a503657edf44fb88c8b115537832ae.png">处可导，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/091d1b1af4704a85b8293d2fd567adbf.png">处连续. D: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6a503657edf44fb88c8b115537832ae.png">处不可导，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/f6523f26b0ca417294d239696ec45367.png">在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/091d1b1af4704a85b8293d2fd567adbf.png">处也可能连续.
- 图示结构中B结点的不平衡力矩（约束力矩）为：（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/88c7b2d7d28442138ce55089cf7b9336.png"> A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/47d0574ad121412e9d4157cfefdbe4e2.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/44cf62aafb4448249c125acf30fafc34.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/c03f18530c2449adb6c23d46c25bcb46.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/a75bc93c9f754579b24d7dc9c1705930.png">
- 下列关于极值命题中正确的是（） A: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/66e36e20da3f43e9bbd9ce0f42dcbe28.png">，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/9d60dd3351b54052b4f4afe27423a0e7.png">必是<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/53f1ecb5821b44f1a56bbc836e49d9b7.png">的极值点 B: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/0a40a2ad34e649e3b999f776e8fe1919.png">，则<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/9d60dd3351b54052b4f4afe27423a0e7.png">必是<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/53f1ecb5821b44f1a56bbc836e49d9b7.png">的极值点 C: 极大值一定大于极小值 D: 若<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/31b1a07ab57347febde3751859364dfb.png">存在且<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/9d60dd3351b54052b4f4afe27423a0e7.png">是极值点，则必有<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/66e36e20da3f43e9bbd9ce0f42dcbe28.png">
- 图示结构用矩阵位法求解时，等效结点荷载列阵为：（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/97ca40c3ee6b4d67a2506e645b72a36e.png"> A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/e86f0ab977d94e67aabeb21f165ac815.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/02fd4eb6cde249668ff035aa6f433ae5.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/bb9ecf1cf72541419a4811205bdbed29.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202007/d4eb9af1d0b744a388f1aa794e44f2d5.png">