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【单选题】
对于封闭体系,体系与环境之间A.
既有物质交换，又有能量交换
B.
既没有物质交换，有没有能量交换
C.
有物质交换，没有能量交换
D.
没有物质交换，只有能量交换
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举一反三
【简答题】How do most students spend(花费) their free time? Do they have time to do the things they like? Let's see what some students do during their free time. Ben is eleven. He has a sister, Kate. Both of them...
【简答题】in general terms
【单选题】导游员小张违反合同约定,中止对旅游者提供旅游服务,那么旅行社应当负担旅游者在被中止旅游服务期间所订的同等级别的住宿等必要费用,并向旅游者支付旅游费用总额的( )作为违约金?
A.
5%
B.
10%
C.
20%
D.
30%
【简答题】in general terms
【简答题】列举五种不同设备,他们是液压传动技术的应用实例。
【单选题】______ next month, employees will have to log in on the company intranet when they arrive at work.
A.
Starting
B.
Having
C.
Taking
D.
Doing
【单选题】The findings show in general terms that contraction of the brain begins ______ in people in the country than in the towns.
A.
farther
B.
better
C.
sooner
D.
greater
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