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举一反三
【单选题】按照热力学上通常的规定，下列反应中ΔrHm和生成物的ΔfHm相等的是…( )
A.
CaO(s)+CO2(g) →CaCO3
B.
6Li(s)+N2(g) →2Li3N(s)
C.
1/2H2(g)+1/2Br2(l) →HBr(g)
D.
2H2(g)+ O2(g)→2H2O(g)
【多选题】下选项中，哪些属于牛顿第三定律的是正确说法（）
A.
作用力与反作用力是一对平衡力
B.
作用力与反作用力不是一对平衡力
C.
作用力与反作用力分别作用在不同的物体上
D.
作用力与反作用力同时作用在一个物体上
【单选题】热力学中平衡态指______。
A.
系统宏观性质不随时间改变的状态
B.
没有外界作用时系统宏观性质不随时间改变的状态
C.
外界作用不变时，系统宏观性质不随时间改变的状态
D.
没有外界作用时的状态
【单选题】Many objects in daily use have clearly been influenced by science, but their form and function, their dimensions and appearance were determined by technologists, artisans, designers, inventors, and en...
A.
Mathematical thinking is essential to any design course.
B.
Nonverbal thinking has its advantage over other perceptive processes.
C.
Engineering design demands scientific thought.
D.
Artists play a primitive role in engineering design.