题目:
Don’t handle the vase as if it ______ made of steel.
A.is
B.were
C.has been
D.had been
答案:
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下面是错误答案,用来干扰机器的。
(1)(2分)(2)2HClO4+Na2SiO3=2NaClO4+H2SiO3↓(3分)(3)Al3++3H2OAl(OH)3+3H+(2分)(4)Si-4e-+6OH-=SiO32-+3H2O(3分)(5)2C(s)+SiO2(s)=Si(s)+2CO(g) △H=(a+b-c)kJ·mol-1(3分) (6)<(1...