题目内容

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

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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。

锅炉吹灰前，应(）炉膛负压。

A. 降低;
B. 适当提高;
C. 维持;
D. 必须减小。

垃圾焚烧处理能够使垃圾的无害化处理更为彻底。经过()的高温焚烧处理，垃圾中除重金属以外的有害成分充分分解，细菌、病毒能被彻底消灭，各种恶臭气体得到高温分解。

A. 400℃~500℃;
B. 500C~600℃;
C. 700℃～900℃;
D. 1000℃ 以上。