单项选择题

仅用一种试剂，即可将Ag+、Hg2+、Zn2+、Fe3+、Ni2+五种离子区分开，这种试剂可选用

A．Na2S
B．H2S
C．NH3·H2O
D．NaOH

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单项选择题

招标人在工程量清单中暂定并包括在合同价款中的用于工程签订时尚未确定或者不可预见的所需材料、工程设备、服务采购的金额是（）。 A. 暂列金额 B. 暂估价 C. 基本预备费 D. 计日工

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听力原文： Mr. StonE.This is Cynthia Riddles from the Northwest GazettE.I am calling to thank you for your past support and to invite you to this year's charity auction. We are currently raising money for Habitats for Humanity's new homeless shelter. The auction will be on Saturday, June 10th at the Starlight Inn. You can call us at 828-2225 to reserve your ticket. Thanks for your support. We look forward to seeing you therE.What is Cynthia hoping to accomplish?A.Sell tickets to the auction.B.Build a homeless shelter.C.Arrange a meeting.D.Make a donation.

A.What
B.Sell
C.
B.Build
D.
C.Arrange
E.
D.Make
F.

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