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下列说法正确的是( )。A.
以铬酸钾作指示剂，用氯化钠标准溶液滴定银离子，测定硝酸银的含量
B.
佛尔哈德法测定碘离子时，必须先加入过量的硝酸银标准溶液，使碘离子沉淀完全，然后再加入指示剂
C.
佛尔哈德法测定氯离子时，加入硝酸银标准溶液后， AgCl 沉淀滤出，然后再滴定滤液，或者加入硝基苯掩蔽
D.
法扬司法中，为使终点时颜色变化明显，常加入糊精等保护胶体
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【简答题】Read the examples of assertions in the table, judge their strength and write down a number between 1 and 3 in the boxes to indicate how strong the assertion is (1= the weakest; 2 = the middle; 3 = the...
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