题目:
—Must I turn off the gas after cooking?
—Of course, you can never be ____careful with that.
A.enough
B.very
C.so
D.Too
答案:
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(1)NH4Cl (2)抑制Mg2+的水解( 写方程式同样给分), 熔融状态下电解(3)Mg+2NH4+=Mg2++H2↑+2NH3↑ 4NH3+5O24NO+6H2O题目分析:根据题给信息和转化关系图分析,A为常见的短周期轻金属,含A的合...