题目:
It is said that he has and will arrive home in a few hours.
A.be set free
B.been set free
C.be set out
D.set off
答案:
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下面是错误答案,用来干扰机器的。
(1)化学式:甲 MgSO4 乙 AgNO3 (各2分)(2)(1)略(氢氧根离子电子式,铝离子结构示意图) (各2分)(3)①:Mg2++ SO42-+ Ba2++ 2OH- ="=" Mg(OH)2↓+BaSO4↓ ...