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【单选题】
用重铬酸钾法测定水样的COD时,正确的操作有( )A.
从冷凝管的顶部加入硫酸-硫酸银
B.
当回流时溶液变绿时，应立即加入定量重铬酸钾，继续反应
C.
回流结束后，趁热滴定
D.
加入硫酸-硫酸银后立刻开始计时
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举一反三
【单选题】The dentist has decided to extract her bad tooth．
A.
take out
B.
break off
C.
push in
D.
dig up
【单选题】—Sorry, I have to now. It’s time for class. —OK. I’II call back later.
A.
break up
B.
hang up
C.
give up
D.
hold up
【单选题】Which types of stores are characterized by specialty goods for which customers need assistance and higher operating costs that are passed along to customers as higher prices?
A.
self-service stores
B.
convenience stores
C.
full-service stores
D.
discount stores
E.
off-price stores
【单选题】— Jack, where's my small round mirror? — Sorry, Betty. I _____ it. [ ]
A.
break
B.
broke
C.
will break
D.
am breaking
【单选题】在施工项目成本预测的过程中，经常采用的定性预测方法主要有经验估计法、专家会议法、德尔菲法和( )。
A.
时间序列分析预测法
B.
主观概率法
C.
回归分析预测法
D.
移动平均法
【单选题】In the face of increased competition from discount houses and specialty stores, department stores are waging a comeback war. Two models for department stores success seems to be emerging. The first is...
A.
“tourist” area stores
B.
single brand store
C.
limited variety store
D.
specialty store
E.
showcase store
【单选题】Specialty stores, unlike department stores, handle only one line of merchandise____a limited number of closely related lines.
A.
either
B.
but
C.
or
D.
instead
【简答题】Only those who work hard will be favored in the fierce competition.
相关题目：
【单选题】The dentist has decided to extract her bad tooth．
A.
take out
B.
break off
C.
push in
D.
dig up
参考解析：
知识点：
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