寒冷的冬天,汽车窗户的玻璃常常结一层白色的冰花,这是水蒸气凝华时通过____(热传递/做功)____(增加/减少)内能的.
L1、L2、L3并联.开关S1控制L1和L2,S2控制L1、L2、L3.
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When marriages ____ (破裂) (动词短语)children are swept into the vortex of their parents' embittered emotions.