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【单选题】
建筑材料依( )可分为无机、有机及复合建筑材料。A.
用途
B.
化学成分
C.
力学性能
D.
工艺性
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【简答题】（2）When I was six, I went to a local grade school．In grade school, I was __36__ the other kids because of my speech and reading __37__．All the kids would shout, “You are a dummy, you are a dummy,” and...
【简答题】_是指冷暖差异，而构成的冷暖感的对比关系。
【简答题】句型转换。 1. I didn't go to school by bike this morning.1 went to school on foot. (改为同义句) I went to school on foot _______ _______ by bike this morning. 2. Jim is too weak to lift the heavy box. (改为同义句) J...
【简答题】有一台四级三相异步电动机，已知额定功率PN=3KW，额定转差率sN=0.03，过载系数λ=2.5，电源频率f=50Hz，求该电动机的额定转矩和最大转矩。
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