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1985年微软推出的Windows1.0操作系统具有哪些特点？

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两直径相等的圆柱正交，其相贯线为？

A. 圆
B. 椭圆
C. 直线
D. 不能确定

两个回转体共轴线时（同轴回转体），其相贯线实形为？

A. 直线
B. 椭圆
C. 圆
D. 无法确定

1. "To heal we must remember,” Mr. Biden said. “It’s hard sometimes to remember, but that’s how we heal. It’s important to do that as a nation. That’s why we’re here today. Between sundown and dusk, let us shine the lights in the darkness along the sacred pool of reflection and remember all who we lost.”2.At the historic crossroad of the "Two Centenary Goals", the new journey of comprehensively building a modern socialist country is about to start. The road ahead is long; striving is the only way forward. We have strived, broken through brambles and thorns, and crossed ten thousand rivers and thousands of mountains. We will continue to strive, march ahead with courage, and create brighter glory!

要获得洁净的蒸汽，必须降低炉水的（)。

A. 排污量;
B. 加药量;
C. 含盐量;
D. 水位。