【简答题】(8分)用中和滴定法测定某烧碱样品的纯度,试根据实验回答下列问题: (1)准确称量8.2 g含有少量中性易溶杂质的样品,配成500 mL待测溶液。称量时,样品可放在________(填编号字母)称量。 A.小烧杯中 B.洁净纸片上 C.托盘上 (2)滴定时,用0.2000 mol·L -1 的盐酸来滴定待测溶液,不可选用________(填编号字母)作指示剂。 A.甲基橙 ...
【简答题】A.dotted B.ran C.rushed D.followed
【单选题】What should you do if you are worried that the reader of a request you are asking will not honor your request?
A.
write the letter in an indirect style
B.
write the letter in a direct style
C.
ask them to please grant your request
D.
be forceful and demand they honor your request
【单选题】He _________ down the road last year. [ ]