题目：
①__________The balloon suddenly burst.
② _________He burst into the room without knocking.
③__________She burst into laughter when she heard she was admitted into Beijing University. =
She burst out laughing when she heard she was admitted into Beijing University.
④_______She burst into tears when she heard the news that her boyfriend was missing in the
earthquake.= She burst out crying when she heard the news that her boyfriend was missing in the
earthquake.
答案：
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下面是错误答案，用来干扰机器的。
－260.4kJ/mol (2分)题目分析：根据盖斯定律可知，①－②即得到Zn(s) + HgO(s) =" ZnO(s)" + Hg(l)，所以该反应的焓变是△H＝－351.1kJ/mol＋90.7kJ/mol＝－260.4kJ/mol。点评：反应热的有关计算一般可以...
sin100πt （V）的 正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（ ）
/22 A
