水冷壁损坏现象是炉膛发生强烈响声，燃烧不稳，炉膛风压变正，汽压温度下降，汽包水位你，给水流量不正常地大于蒸汽流量，烟温降低等。
参考答案：对
The thief was apprehended, but his accomplice had disappeared.
A．people who saw him
B．the person who helped him
C．guns and knives
D．stolen goods
巴豆酸的结构简式为CH3－CH＝CH－COOH，现有
①溴水 ②氢氧化钠溶液 ③2－丙醇 ④酸化的高锰酸钾溶液。
试根据其结构特点判断在一定条件下能与巴豆酸反应的物质组合是
A．①④
B．①③④
C．②③
D．①②③④
