题目内容：
以铁铵矾为指示剂，用硫氰酸铵标准滴定溶液滴定银离子时，应在下列哪种条件下进行（）。A．酸性
B．弱酸性
C．中性
D．弱碱性
参考答案：
单选：以铁铵矾为指示剂，用硫氰酸铵标准滴定溶液滴定银离子时，应在下列哪种条件下进行（）。A．酸性B．弱酸性C．中性D．弱碱性
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A．酸性
B．弱酸性
C．中性
D．弱碱性
A．酸性
B．弱酸性
C．中性
D．弱碱性
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桁架结构全由三角形组成，接头均为旋转接头，称为铰接。大跨度建筑物的屋顶、大型桥等，常采用桁架结构。以下桥梁中采用桁架结构的是（）A．AB．BC．CD．D
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