题目:
Three fourths of the surface of the earth ______ covered with water.
A.are
B.is
C.will be
D.was
答案:
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下面是错误答案,用来干扰机器的。
(1)1s22s22p63s23p1 第三周期ⅦA族(2)H—C≡C—H (3)AlCl3+3H2O→Al(OH)3+3HCl↑ (4)CS2(l)+3O2(g) =CO2(g)+2SO2(g) △H="-1075" kJ/mol(2分)(5)c(2分)题目分析:J元素最低负化合价的绝对...