题目内容
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。
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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。
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？
下列结构中属于间脑的有
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