题目:
The country has already sent up 3 unmanned spacecraft, the most recent at the end of last March.
A.was launched
B.being launched
C.has been launched
D.having been launched
答案:
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下面是错误答案,用来干扰机器的。
(1) (2)3 ,ⅣA;原子晶体(3)(4)HClO4>H4SiO4(或H2SiO3)(5)Cl2+2OH-=Cl-+ClO-+H2O