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【单选题】
硅及其氧化物能发生如下反应： ①Si+ O 2 SiO 2 ②Si +2NaOH + H 2 O Na 2 SiO 3 + 2H 2 ↑ ③SiO 2 + 2C Si + 2CO ④SiO 2 + Na 2 CO 3 Na 2 SiO 3 + CO 2 ↑ 下列说法错误的是A.
①属于化合反应
B.
Na 2 SiO 3 中Si元素的化合价为+4价
C.
反应③中氧化剂是C
D.
Si和SiO 2 可以相互转化
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【单选题】听力原文： Years ago before there were refrigerators, an icehouse was a building used for storing ice. The first teahouses were in the cellars of farmhouses. Pieces of ice, mixed with snow and meadow grass...
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