图示杠杆机构中B处为螺栓联接，材料许用切应力为 http://edu-image.nosdn.127.net/_PhotoUploadUtils_7a3baa2d-246b-4ad6-b430-80e66d36fa83.png，不考虑挤压，已知支座B处约束力为http://edu-image.nosdn.127.net/_PhotoUploadUtils_b090252d-7a1d-49ae-9a9f-329e8bee92a6.png ，则螺栓最小直径为（ ）。http://edu-image.nosdn.127.net/49782124E78AD442DDD9D71CDF6FC533.png?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/BA4A589CA9C97E38D218216266737FE0.png?imageView&thumbnail=890x0&quality=100
举一反三
- http://edu-image.nosdn.127.net/EC9D7EA61F1EFFB86E66B5E0259BCBBD.png?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/13F84D3AF06E795D4BF13D9C8B0AD44F.png?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC:"下图所示工具为（ ）。http://edu-image.nosdn.127.net/D6BFA044A165F7787DDF229A39C5C236.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/2F463E8BC7003C7A6DE10AD41DB2F19E.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/A703FA1F4FAFAE1A1224262AF1D87971.jpg?imageView&thumbnail=890x0&quality=100";
- 中国大学MOOC: 若第9题中当电路中总电压http://edu-image.nosdn.127.net/45D53DF610EBF196EBE5238589C91ABF.png?imageView&thumbnail=890x0&quality=100，http://edu-image.nosdn.127.net/8232D55E2C1346F746EFBB0780167F51.png?imageView&thumbnail=890x0&quality=100，http://edu-image.nosdn.127.net/A2CC3366BF7376F66D8EFFEB40B97149.png?imageView&thumbnail=890x0&quality=100，以下叙述正确的是
- 已知图示有压混联输水管路（按长管计）各管段的沿程阻力系数http://edu-image.nosdn.127.net/1443EEDD6C2FA09BB126BDB9642044BA.png?imageView&thumbnail=890x0&quality=100，管径http://edu-image.nosdn.127.net/974CD2163F1D3BFAAEDC8DA84872F1CA.png?imageView&thumbnail=890x0&quality=100，管长http://edu-image.nosdn.127.net/76A594A1299928A8955B35FC20252D31.png?imageView&thumbnail=890x0&quality=100，流量http://edu-image.nosdn.127.net/1D52DAEDDD85EC829BD9C6E6F96AE143.png?imageView&thumbnail=890x0&quality=100,,则http://edu-image.nosdn.127.net/DAC36D2F41C6C3F84F776BC849094BA1.png?imageView&thumbnail=890x0&quality=100中k=（ ）。http://edu-image.nosdn.127.net/06283F2B8E549ACD83D8DDBBD7E4BE7C.png?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC: http://edu-image.nosdn.127.net/8E989C885179CAD3E88F4ED14999CEF9.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/270D935AC13F8AC30775CB323882970C.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/E8F4932FC8C534FE91D7CCBE9744E7AD.jpg?imageView&thumbnail=890x0&quality=100