We（）the cook because her cooking was so po_爱下问搜题

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问题单项选择题

We（）the cook because her cooking was so poor.

A.dismissed

B.deserted

C.resigned

D.withdrew

答案

参考答案：A

选择题

往含I^-和Cl^-的稀溶液中滴入AgNO₃溶液，沉淀的质量与加入AgNO₃溶液体积的关系如图所示。则原溶液中c(I^-)/c(Cl^-)的比值为

A．(V2－V1)/V1

B．V1/V2

C．V1/(V2－V1)

D．V2/V1

单项选择题

砼中外加剂的掺量不超过水泥质量的（）

A.1%

B.2%

C.4%

D.5%