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【单选题】

节能墙体外保温采用聚苯乙烯泡沫塑料板材,下列( )经济技术指标较合理。

A.
普通型,容重20kg/m3
B.
自熄型,容重20kg/m3
C.
普通型,容重40kg/m3
D.
自熄型,容重12kg/m3
参考答案:
参考解析:
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【单选题】Desperately short of living space and dangerously prone to flooding, the Netherlands plans to start building homes, businesses and even roads on water. With nearly a third of the country already cover...

A.
most parts of the country are covered by water
B.
the country is constantly threatened by floods
C.
it will promote the cultivation of flowers
D.
people think it better to live on water