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问题 单项选择题

立克次体病发病3周内的抗体主要是IgM，晚期恢复期则为IgG，只是在复发型斑疹伤寒（Brill氏病）于疾病早期出现（）

A、IgA

B、IgD

C、IgG

D、IgM

E、IgE

答案

参考答案：C

选择题

下列离子方程式正确的是（   ）

A．铁与稀硝酸反应：Fe＋2H＋=Fe2＋＋H2↑

B．用氨水吸收少量的SO2: NH3·H2O +SO2＝NH4++HSO3－

C．用小苏打治疗胃酸过多：HCO3－+H+ = CO2↑+H2O

D．用FeCl3溶液腐蚀印刷电路板：Fe3++Cu = Fe2++Cu2+
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