图示机构中()虚约束。<img src='https://img.soutiyun.com/ask/zq/20210725/996075772910671.png' />

计算图示机构的自由度，若含有复合铰链，局部自由度和虚约束请明确指出。https://assets.asklib.com/images/image2/20180612105310643.jpg

计算图示机构的自由度，若含有复合铰链，局部自由度和虚约束请明确指出。https://assets.asklib.com/images/image2/2018072009304645491.jpg

计算图示机构的自由度，若含有复合铰链，局部自由度和虚约束请明确指出。https://assets.asklib.com/images/image2/2018061215152375686.jpg

计算图示机构的自由度，并指出复合铰链、局部自由度、 虚约束，判断该机构运动是否确定。https://assets.asklib.com/images/image2/2018061315453292636.jpg

计算题：计算图示机构的自由度，要求指出可能存在的复合铰链、局部自由度和虚约束。https://assets.asklib.com/psource/2015052709593361597.png

计算图示机构的自由度。如有复合铰链、局部自由度和虚约束，应指出。https://assets.asklib.com/images/image2/2018061211333686156.jpg

在图示a、b两个单元体的受力状态中______。<img src='https://img2.soutiyun.com/ask/2020-01-10/9474948895505.png' />

图示结构中A截面的弯矩()。<img src='https://img2.soutiyun.com/shangxueba/ask/2013001-2016000/2014856/ct_jgzjgyxm_jgzjgyxchoose_00401(20093).jpg' />

已知i为虚单位<img src='https://img2.soutiyun.com/shangxueba/ask/18162001-18165000/18164859/2015122210164736518.jpg' />，则z的实部为（）。

图示中接头，水平杆采用a×b的矩形截面，斜杆与水平杆的夹角为a，其挤压面的面积为（）<img src='https://img2.soutiyun.com//1/2021-06-08/992041685020271.jpg' />

图示桁架有几根零杆()<img src='https://img2.soutiyun.com//1/2021-05-13/989774419893367.png' />

图示结构的超静定次数为()。<img src='https://img2.soutiyun.com/1/2021-03-11/984326378977064.jpg' />

图示结构中，桁架杆件的零杆个数为()。<img src='https://img2.soutiyun.com/shangxueba/ask/2013001-2016000/2014858/ct_jgzjgyxm_jgzjgyxchoose_00403(20093).jpg' />

图示三铰刚架受力F作用，则B处约束力的大小为：<img src='https://img2.soutiyun.com/ask/uploadfile/2751001-2754000/57b7470f049e1cc00a154219a94a1947.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2751001-2754000/f9cd6ff0306fc0f5a9453b8b33c10498.jpg' />

图示体系为()。<img src='https://img2.soutiyun.com/shangxueba/ask/2022-04/15/915/20220415152954904.png' />

图示7所指部位()<img src='https://img2.soutiyun.com/shangxueba/ask/18621001-18624000/18623454/2014052210285693252.jpg' />

如果把图示电路中的变压器视为理想器件，<img src='https://img2.soutiyun.com/shangxueba/ask/18774001-18777000/18774272/2016071815505494842.jpg' />时，（）。<img src='https://img2.soutiyun.com/shangxueba/ask/18774001-18777000/18774272/201607181551011369.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18774001-18777000/18774272/2016071815510514617.jpg' />

图示结构中，a杆的轴力为：（）<img src='https://img2.soutiyun.com/shangxueba/ask/17733001-17736000/17734986/2015102815093170242.jpg' />

图示体系为() 。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-10/30/254/20211030142100599.png' />

题图示电路中，I5等于()<img src='https://img2.soutiyun.com//1/2021-05-26/990874546252889.png' />

图示桁架B点竖向位移（向下为正）△<img src='https://img2.soutiyun.com/shangxueba/ask/17727001-17730000/17727028/2015102815202050082.jpg' />为：（）<img src='https://img2.soutiyun.com/shangxueba/ask/17727001-17730000/17727028/2015102815201840985.jpg' />

图示桁架中零杆的数目为(不包括支座链杆)()。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-11/18/1306/20211118110617563.png' />

在图示的定轴轮系中，齿轮1的转向如图中箭头所示，则齿轮9的转向为（）<img src='https://img2.soutiyun.com/shangxueba/ask/17802001-17805000/17803411/2017060108553441522.jpg' />

桁架中把内力为零的杆件称为零杆。图示桁架中,零杆为()。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-09/30/891/20210930110441405.png' />