图4-44所示机构由杆O1A、O2B和三角板ABC组成。已知:杆O1A转动的角速度为ω,O1A=O2B=r,AC=h,O1O2=AB,则图示瞬时点C速度νC的大小和方向为()。
Project selection methods involve measuring value or attractiveness to the project owner or sponsor and may include other organizational decision criteria ()is not a project selection method.
图示机构O1ABO2为一平行四边形,O1A=O2B=R,O1O2=AB=l,在该瞬时杆O1A绕O1轴的角速度为ω,角加速度为ε,则质量为m的均质杆AB的惯性力系向其质心C简化的主矢量R1和主矩的大小分别为()。
() are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.
图示平面机构由O1A、O2B杆件与直角三角板ABC构成。图示位置O1A、O2B均垂直水平线O1O2,且O1A=O2B=BC=R,AB=2R,此时杆O1A以角速度ω转动,则三角板上C点的速度应为()。
() are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.
— Do you prefer a portable or a clumsy 3D printer?
— .
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
A rectangular area that can contain a document, program, or message.
Graphic representations for a program, type of file, or function .
某工程网络计划工作逻辑关系如下表所示,则工作A的紧后工作有( )。
[图1]
某分部工程流水施工计划如下图所示,该流水施工的组织形式是( )。
[图1]
如图所示,电压为( )。
[图1]
某矩形基础底面尺寸3m×3m,自重应力和附加应力分布图如下图所示,第②层土的室内压缩曲线如下图所示。
根据上图所示的应力分布图和压缩曲线,第②层土的压缩系数a最接近于()。图4-39所示机构中,杆O1A=O2B,O1A∥O2B,杆O2C=O3D,O2C∥O3D,且O1A=20cm,O2C=40cm,CM=MD=30cm,若杆O1A以角速度ω=3rad/s匀速转动,则M点速度的大小和B点加速度的大小分别为()。
图4-44所示机构由杆O1A、O2B和三角板ABC组成。已知:杆O1A转动的角速度为ω,O1A=O2B=r,AC=h,O1O2=AB,则图示瞬时点C速度νC的大小和方向为()。
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