题目内容

摆动导杆机构的极位夹角θ与导杆摆角ψ的关系为。

查看答案

搜索结果不匹配？点我反馈

更多问题

极位夹角是曲柄与_在两共线位置时曲柄所夹的锐角。θ=0,速比行程系数k=,说明机构____急回特性。

曲柄摇杆机构中,摇杆的急回运动特性愈大时,曲柄的极位夹角愈大。

A. 对
B. 错

The American pharmaceutical _1_ Pfizer has said it's abandoning plans to buy the British-Swedish _2 company AstraZeneca. The announcement _3_ a week after Pfizer's 190-billion-dollar-takeover offer was turned down by its rival. The decision put a _4_ to what would have been the largest merger in the industry's history.Brazil's national football team has started its world cup preparations amid fresh protests in Rio de Janeiro. The Brazilian football legend Ronaldo who has been acting as an ambassador for the World Cup has blamed the government for the delays in infrastructure projects and 5__ an opposition candidate for the this year's presidential elections. Here is John McManus.

妊娠合并梅毒的孕妇的诊断、治疗？