问题
选择题
They look different, _____ they are twins.[ ]
A. because
B. though
C. but
D. so
答案
答案：B
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They look different, _____ they are twins.[ ]
A. because
B. though
C. but
D. so
答案：B
4Na+O2↑+2H2O；后来盖—吕萨克用铁与熔融氢氧化钠作用也制得钠，反应原理为：3Fe+4NaOH(熔融)
Fe3O4+2H2↑+4Na↑.下列有关说法正确的是 [ ]