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13春学期《环境工程》在线作业1(国外英文资料)
13春学期《环境工程》在线作业1(国外英文资料)
14 Northeastern University spring 13 autumn East 13 spring semester Environmental Engineering online homework 1
Total score: 100 test time: -
RadioButtonList
A multiple-choice question
To determine the problem
RadioButtonList, (a total of 6 questions, a total of 30 points.)
1. the correct statement is: (a)
A. dust with the specific surface area decreased, the reduction in water content and temperature, the charge quantity increased.
B. dust with the specific surface area increased, the reduction in water content and temperature, the charge quantity increased.
C. powder homework answer does not upload, first for your review, if you need to answer the specific look at my name to find the dust with the specific surface area increased, water content decreased and the decrease of temperature, the charge quantity increased.
D. dust with the specific surface area increased, the increase of water content and temperature, the charge quantity increased.
Score: 5 points
2. according to statistics, in all kinds of noise sources affect the city environment, () the most extensive impact, is the main source of noise jamming environment.
A. construction noise
B. industrial noise
C. noise in social life
D. traffic noise
Score: 5 points
Comprehensive utilization of coal gangue is not included (3.)
A. using coal gangue as fuel.
Brick and tile production with coal gangue B..
C. extraction of metals from coal gangue.
Cement production using coal gangue D..
Score: 5 points
The following right: (4.)
A. voice loud degree is determined by the sound pressure level and frequency of two factors.
B. voice loud by sound intensity and sound intensity level of two factors.
C. voice loud degree is determined by the sound pressure and sound pressure level of two factors.
D. voice loud is determined by the degree of sound power and sound power level of two factors.
Score: 5 points
5. gas temperature and humidity on the particles have an important impact resistance, following
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