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u,v为x,y的函数,x=rcosθ,y=rsinθ,试由<img src='https://img2.soutiyun.com/ask/2021-01-26/980518171905549.png' />
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S<sub>1</sub>与S<sub>2</sub>,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()
若f(x)为连续函数,且F'(x)=f(x),则<img src='https://img2.soutiyun.com/ask/2020-08-13/966175500936834.png' />().此题为判断题(对,错)。
若系统<img src='https://img2.soutiyun.com/ask/2020-02-27/951684916952625.png' />,y=[0 1]x,则该系统( )。
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()。
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()。
在强度曲线图上,若吃水d的垂直线和<img src='https://img2.soutiyun.com/shangxueba/ask/18279001-18282000/18280012/2015011215071070351.jpg' />的交点处于实线之外,说明船舶强度处于()。
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' />