理想气体从 p1 绝热膨胀至 p2 时,W=ΔU ,绝热膨胀时若外压为零则W=0 ,ΔU=0;若外压不为零则ΔU ≠ 0 。以上两ΔU 不相等与 U 为状态函数的性质是否矛盾?
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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