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【单选题】
大气正常组成中的三大组分为A.
氮、氧、氢
B.
氮、氧、二氧化碳
C.
氮、氧、氖
D.
氮、氧、氩
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反馈参考答案：
举一反三
【单选题】Wendy spends $30 a week on movies and magazines. The price of a movie is $8, the price of a magazine is $2, and Wendy sees 3 movies a week and buys 3 magazines. The price of a magazine now increases t...
A.
3; 3
B.
less than 3; less than 3
C.
more than 3; fewer than 3
D.
less than 3; more than 3
【多选题】以下试剂能作为基准物质的是
A.
优级纯的Na 2 B 4 O 7 •10H 2 O
B.
99.99%的纯锌
C.
105-110℃烘干2h的Na 2 C 2 O 4
D.
NaOH
【单选题】It_____________you 30 minutes to take a coach there and it_________less than 6$. A.takes, spends B.takes, costs C.costs, spends D.spends, costs
A.
.takes, spends
B.
.takes, costs
C.
costs, spends
D.
spends, costs
【简答题】对于循环操作的平推流反应器，当循环比β→0时为（）反应器，而当β→∞时则相当于（）反应器。
【简答题】对于循环操作的平推流反应器，当循环比β→0时反应器内返混为（），而当β→∞时则反应器内返混为（）。
【简答题】某汽车客运站年平均日发送旅客5900人,拥有客运车辆100台,维修车位10个(事实上投入使用的只有6个),请你合理配置该汽车客运站售票员、服务员、行包员、搬运员、驾驶员、调度员和维修人员的人数。 要求:四舍五入 1.售票员为(1)人 2.服务员为(2)人 3.行包员为(3)人 4.搬运员为(4)人 5.驾驶员为(5)人~(6)人 6.调度员为(7)人~(8)人 7.维修人员为(9)人~(10)人
【单选题】听力原文：W: What's Wendy doing here today? I thought she was supposed to be out of the office on Tuesdays. M: She decided she'd rather have Wednesdays off instead. Q: What can we learn about Wendy from th...
A.
She has changed her schedule.
B.
She works less than she used to.
C.
She is going to ask for a leave on Wednesday.
D.
She is going to have her vacation on Tuesday.
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