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【简答题】
化学在防治大气污染和水污染等方面发挥了重要作用，使更多地化学生产工艺和产品向着环境友好的方向发展． （1）为从源头消除污染，生产、生活中要选择对环境影响小的燃料，已知充分燃烧1kg天然气和煤所产生的CO 2 和SO 2 气体的质量如图所示，则______燃烧产生的气体更易导致酸雨． （2）某火力发电厂为了防止环境污染，需将废气中的二氧化硫进行处理，其发生的主要反应为2CaCO 3 +2SO 2 +O 2 =2CaSO 4 +2CO 2 ，若100g废气中含有1.6g二氧化硫，则处理1000g这种废气需含碳酸钙80%的石灰石______g． （3）某工厂以流量10L/s（升/秒）排出含硫酸9.8%的工业废水，现向该废水中排入含氢氧化钠2%的工业废水，与硫酸反应后再排出，要使处理后的废水呈中性，则含氢氧化钠2%的工业废水的流量应为______L/s（上述含酸废水和含碱废水的密度均近似为1g/cm 3 ）．
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举一反三
【简答题】已经定义a=3,执行语句a+=a-=a*=a+2后,a的值是( )。
【单选题】Many a player who had been highly thought of has ________ from the tennis scene.
A.
disposed
B.
disappeared
C.
discouraged
D.
discarded
【单选题】Many a player who had been highly thought of has ________ from the tennis scene.A．disposedB．disapp
A.
3. Many a player who had been highly thought of has ________ from the tennis scene. A．disposed
B.
disappeared
C.
discouraged
D.
discarded
【单选题】— _____ are these clothes? —They are those _____ . [ ]
A.
Whose; player's
B.
Who's; player's
C.
Whose; players'
D.
Who's; players'
【简答题】Many a player who had been highly thought of ______ from the tennis scene．许多得到高度评价的运动员都已经从网球赛场上消失了。
【单选题】Many a player who had been highly thought of ______ from the tennis scene.
A.
have disappeared
B.
has disappeared
C.
disappear
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