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【单选题】
Suppose apartments rent for $1,600 in Boston. If the city of Boston forces each landlord to charge $1,200, there will be:A.
. an increase in producer surplus for each landlord.
B.
. a surplus of new apartments in Boston.
C.
. an increase in consumer surplus for Bostonians who can find apartments for $1,200.
D.
. an increase in total surplus.
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【单选题】The banking system developed fast in the late 19th century mainly due to ________.
A.
overseas competition
B.
matured home market
C.
an imbalance in trade
D.
growth in financial demand
【单选题】下列关于空气净化的叙述正确的是
A.
局部净化是彻底消除人为污染，降低生产成本的有效方法
B.
按照要求一般将生产厂区划分为生产区、控制区、洁净区
C.
洁净级别从100～100000级，尘粒数逐渐减小
D.
净化度标准只考虑尘粒个数，不考虑尘粒大小
E.
只要进入的空气保证洁净，层流和紊流都可以达到超净目的
【判断题】Fast fading is due to scattering of the signal by object near transmitter
A.
正确
B.
错误
【单选题】Shanghai' s car rental industry is growing so fast mainly due to ________.
A.
better cars supplied by producers
B.
fast service offered by car rental firms
C.
the increasing number of white-collar employees
D.
people's growing interest in traveling during holidays
【单选题】下列关于空气净化的叙述正确的是
A.
局部净化是彻底消除人为污染，降低生产成本的有效方法
B.
按照要求一般将生产厂区划分为生产区、控制区、洁净区
C.
洁净级别从100到100000级，尘粒数逐渐减小
D.
净化度标准只考虑尘粒个数，不考虑尘粒大小
E.
只要进入的空气保证洁净，层流和紊流都可以达到超净目的
【单选题】下列有关空气污染的叙述,正确的是( ) 。
A.
PM2.5是直径在2.5微米以下的可吸入颗粒物
B.
空气质量级别越高，空气质量越好
C.
臭氧层能吸收外太空射线，臭氧不是污染物
D.
二氧化碳不是有害气体，没有计入空气污染指数的项目
【简答题】A．due to B．due in C．due D．due of
【判断题】The rapidfluctuations in the spatial and temporal characteristics caused by local multipath areknown as fast fading (short-term fading due to fast spatial variations). Distances ofabout half a wavelen...
A.
正确
B.
错误
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