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冬季在塑料大棚中种植蔬菜，除保证适当的水、肥和控制适宜的温度外，还必须保证充足的光照并适当补充气肥（CO 2 ），以满足蔬菜光合作用的需要。某同学设计了在自家大棚中释放气肥的方法。用塑料桶盛放稀释过的工业废酸并悬挂在，需要时在桶中加入一些固体物质，如块状石灰石、纯碱、小苏打、碳酸氢镀等，即可有气肥放出。试回答： （1）若废酸中主要含有硫酸，则固体物质不能选用上述物质中的________，因为_______________。 （2）若废酸是盐酸、硫酸、硝酸的混合酸，则从反应产物在农业生产中的再利用考虑，固体物质最好选用上述物质中的_________，写出所选物质与硫酸反应的化学方程式_______________。
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【单选题】Frank Lloyd Wright probably is the greatest architect that the United States has ever produced. He was very【21】and had a natural ability【22】. His buildings were not only beautiful, but they were【23】fu...
A.
conscious
B.
conceited
C.
talented
D.
content
【简答题】Most people give little thought to the pens they write with, especially since the printers in modern homes and offices mean that very 小题1: things are hand written. All too often, people buy a pen base...
【单选题】根据短文，回答下列各题。 Frank Lloyd Wright probably is the greatest architect that the United States has ever pro-duced．He was very____21____and had a natural ability____22____．His buildings were not onlybeautif...
A.
conscious
B.
conceited
C.
talented
D.
content
【单选题】The car is very small and only 2 people can _________.
A.
fit in
B.
in
C.
sit
D.
buy with
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