若系统<img src='https://img2.soutiyun.com/ask/2020-02-27/951684916952625.png' />，y=[0 1]x，则该系统( )。

在指定温度下，若A、B两液体形成理想溶液，且纯A的饱和蒸气压<img src='https://img2.soutiyun.com/latex/latex.action' />大于纯B的饱和蒸气压<img src='https://img2.soutiyun.com/latex/latex.action' />，则( )。

甲钢伸长率为<img src='https://img2.soutiyun.com/latex/latex.action' />，乙钢伸长率为<img src='https://img2.soutiyun.com/latex/latex.action' />，试验条件相同，若二者数值相等，则( )。

若函数<img src='https://img2.soutiyun.com/ask/2020-08-13/966178131180276.png' />,则<img src='https://img2.soutiyun.com/ask/2020-08-13/966178120045639.png' />。().此题为判断题(对，错)。

电路如图7.10所示，已知<img src='https://img2.soutiyun.com/latex/latex.action' />若晶闸管的控制角α＝30°，则其导通角θ为( )。<img src='https://img2.soutiyun.com/ask/5451001-5454000/abde58fa65c361da53e31695df8d7676.gif' />

已知f(0)=0，若<img src='https://img2.soutiyun.com/latex/latex.action' />，则f&39;(0)=( )．

若<img src='https://img2.soutiyun.com/latex/latex.action' />，<img src='https://img2.soutiyun.com/latex/latex.action' />，则下列式子成立的是( )

若<img src='https://img2.soutiyun.com/latex/latex.action' />则a=( )

若级数<img src='https://img2.soutiyun.com/latex/latex.action' />与<img src='https://img2.soutiyun.com/latex/latex.action' />分别收敛于S₁与S₂，则( )式未必成立．

判断下列各广义积分的敛散性，若收敛，计算其值：<img src='https://img2.soutiyun.com/ask/2020-02-20/951076511215764.png' />

若二阶系统的阻尼比和固有频率分别为<img src='https://img2.soutiyun.com/shangxueba/ask/18000001-18003000/18002049/201506111136169875.jpg' />，则其共轭复数极点的实部为（）<img src='https://img2.soutiyun.com/shangxueba/ask/18000001-18003000/18002049/2015061111355067497.jpg' />

若<img src='https://img2.soutiyun.com/ask/2020-03-10/952728203989995.png' />，x≠0，且f(x)在x=0处连续，则( )．

证明:若<img src='https://img2.soutiyun.com/ask/2020-11-11/973945141033851.png' />

已知两个物体A和B的质量以及它们的速率都不相同,若物体A的动量在数值上比物体B的大,则A的动能<img src='https://img2.soutiyun.com/ask/2020-04-29/957026950641931.png' />与B的动能<img src='https://img2.soutiyun.com/ask/2020-04-29/95702696453207.png' />之间()。

患者，女性，46岁，<img src='https://img2.soutiyun.com/shangxueba/ask/18090001-18093000/18092457/2015092408524299965.jpg' />牙痛反复发作1年，若诊断为牙髓-牙周联合病变，其治疗方法为（）

系统如图所示，若系统在平衡状态时，则物块C与墙间的摩擦角的取值范围()。<img src='https://img2.soutiyun.com/shangxueba/ask/1818001-1821000/1818835/ct_jgzjgysm_jgzjgyschoose_00654(20093)1.jpg' />

图示一半径为R的圆柱形容器，内盛有密度为<img src='https://img2.soutiyun.com/shangxueba/ask/17967001-17970000/17969999/2016031610221065859.jpg' />的液体，若容器以等角速度<img src='https://img2.soutiyun.com/shangxueba/ask/17967001-17970000/17969999/2016031610221885175.jpg' />绕OZ轴旋转，则A点的压强为（）。

一低压照明系统，系统电源电压及电流瞬时值表达式分别为，<img src='https://img2.soutiyun.com/shangxueba/ask/17481001-17484000/17483421/2015102808485880224.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/17481001-17484000/17483421/2015102808493028298.jpg' />，问：

四格表卡方检验，若<img src='https://img2.soutiyun.com/shangxueba/ask/18099001-18102000/18099955/2015111610514050431.jpg' />=3.84，则（）

用摩尔法测定<img src='https://img2.soutiyun.com/shangxueba/ask/17880001-17883000/17880826/2014122709450650617.jpg' />时，若控制pH＝4.3，则使分析结果（）。

若<img src='https://img2.soutiyun.com/latex/latex.action' />，<img src='https://img2.soutiyun.com/latex/latex.action' />试证明时域卷积定理<img src='https://img2.soutiyun.com/latex/latex.action' />和频域卷积定理<img src='https://img2.soutiyun.com/latex/latex.action' />

若向量β不能由<img src='https://img2.soutiyun.com/ask/2021-01-01/978361429025286.png' />线性表示，则向量组<img src='https://img2.soutiyun.com/ask/2021-01-01/978361441040973.png' />线性无关()此题为判断题(对，错)。

证明：若f为函数，则<img src='https://img2.soutiyun.com/ask/2020-08-12/966099742187747.png' />

证明:若<img src='https://img2.soutiyun.com/ask/2020-11-13/974144553195733.png' />

系统的传递函数为<img src='https://img2.soutiyun.com/shangxueba/ask/17991001-17994000/17992371/2018032817055661358.jpg' />，则其幅频特性为（）。<img src='https://img2.soutiyun.com/shangxueba/ask/17991001-17994000/17992371/2018032817060729748.jpg' />