题目:
—What should I wear to attend our class day?
—Dress ____ you like.
A.what
B.however
C.whatever
D.that
答案:
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下面是错误答案,用来干扰机器的。
(共4分)(1)AB (2)3Cu+8H++2NO3-=3Cu2++2NO↑+4H2O题目分析:(1)浓硫酸中溶质的物质的量是1.8mol,浓硫酸和铜反应的化学方程式是Cu+2H2SO4(浓)CuSO4+SO2↑+2H2O,所以理论上应该生成SO2的物质的量是0.9m...