【单选题】4 (76-78页Unit 3)What kind of people think Internet addiction is not a real problem?
A.
Those who have Internet addiction
B.
Those who have a weak personality.
C.
Those who can well manage their time spent online
D.
Those who think the Internet is very powerful and useful
【单选题】分光光度法测量条件的选择:采用紫外 - 可见分光光度法测定蔬菜中 NO2- 的含量,试液提取液为黄色, NO2- 与无色的显色剂显色后生成红色产物,与 540nm 处测定其吸光度。应选取的参比溶液是
【单选题】Unit 08-6.mp3: What's wrong with the consignment?
A.
It was damaged seriously
B.
The loss of breakage was 30%
【简答题】列竖式计算.(打“☆”要验算) ☆59÷4= 83÷6= 80÷5= ☆76÷7= 73÷9= ☆65÷7= ☆43÷5= 48÷6= 87÷3= ☆76÷4= 49÷3=
【单选题】Unit 6-3.mp3: What will be used in the cargo for packing?