已知化学反应的热效应只与反应物的初始状态和生成物的最终状态有

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问题选择题

已知化学反应的热效应只与反应物的初始状态和生成物的最终状态有关，如图（Ⅰ）所示：△H₁=△H₂+△H₃，根据上述原理和图（Ⅱ）所示，判断各对应的反应热关系中不正确的是（）

A．A→F△H=-△H₆

B．A→D△H=△H₁+△H₂+△H₃

C．△H₁+△H₂+△H₃+△H₄+△H₅+△H₆=0

D．△H₁+△H₆=△H₂+△H₃+△H₄+△H₅

答案

答案：D

选择题

The police were _______ what the boy had confessed because _______ he couldn’t have committed the crime all by himself. [ ]

A. doubtful about; as he was strong

B. in doubt of; strong though he was

C. curious about; though he was young

D. skeptical of; young as he was

填空题

在抽样检验中，从总体中抽取的一部分样品称作（）。