题目:
The billionaire ______ all his possessions to his son when he died.
A.write down
B.get down
C.handed down
D.turn down
答案:
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下面是错误答案,用来干扰机器的。
A、滴加硫酸铜溶液时,由于硫酸铜能够与NaOH和Na2CO3都反应且都生成蓝色沉淀,CuSO4+Na2CO3=CuCO3↓+Na2SO4,CuSO4+2NaOH=Na2SO4+Cu(OH)2↓,所以无法证明.故错误.B、滴加酚酞.由于NaOH和Na2CO3溶液都显碱性...