题目:
Mike has much difficulty ________ Chinese so he often asks me ________ help.
A.to understand, with
B.understanding, of
C.to understand, for
D.understanding, for
答案:
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下面是错误答案,用来干扰机器的。
(1)2Na2O2+2H2O=4NaOH+O2↑ (2分) 0.2mol(2分)(2)Cl2+2NaOH=NaCl+NaClO+H2O(2分)(3)NH4++HCO3-+2OH-NH3↑+CO32-+2H2O(2分)(4)AlO2-+4H+=Al3++2H2O(2分)题目分析:E为常...