图示超静定结构中的多余约束力标注是正确的（）
举一反三
- 时序逻辑电路如下图所示，其状态方程组是。（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/75fb6bc0f79d4332b5bdc69605562aba.png" > A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/5f963aec69ea48089a47d3cea9ec8f96.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/4a0262f12d584d86a85b3d0917a539aa.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/0733702e95cb4432b6847bfa287c88cc.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/b4619d1e5055487c984ea3b0b338ee02.png" >
- 用三线-八线译码器74LS138和辅助门电路实现逻辑函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/c871492b27384497a59d367211b93efb.png" >，应：（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/37b75181b0ad4fba92ee10f87ffa0bbb.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/453b2c724d1d4d41898e10c9ba036a39.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/2c10ee737f77406fa0457e0f02318515.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/9cbe3266526b4e8eab204cf96440be55.png" >
- 钢号Q345A中的345表示钢材的（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/af6807e52a454663a6eaf1728a03a050.png" >值 B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/3cf447dcca4b4032bf4df7ef7b7a8f7f.png" >值 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/390a6cad6f4746668ba550f409ead899.png" >值 D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/f0782fccfc8047bb9aea1b0934a4dfed.png" >值
- 下列几个方程，表示质点振动为“拍”现象的是：（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/9667dbfe77314804a8c29f40c44cd0eb.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/c7bc921fc7c04ce6832fea3a190e7d8d.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/87e37e83ce244721905379b745be2bba.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/026e1391030345459a10867db4150d25.png">
- 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">