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【单选题】
Which of the following statements about the effects of rent control is correct? The short-run effect of rent control is a surplus of apartments, and the long-run effect of rent control is a shortage of apartments. The short-run effect of rent control is a relatively small shortage of apartments, and the long-run effect of rent control is a larger shortage of apartments. In the long run, rent control leads to a shortage of apartments, and the quality of available apartments is improved by rent control. The effects of rent control are very noticeable to the public in the short run, because the primary effects of rent control occur very quickly.A.
The short-run effect of rent control is a surplus of apartments, and the long-run effect of rent control is a shortage of apartments.
B.
The short-run effect of rent control is a relatively small shortage of apartments, and the long-run effect of rent control is a larger shortage of apartments.
C.
In the long run, rent control leads to a shortage of apartments, and the quality of available apartments is improved by rent control.
D.
The effects of rent control are very noticeable to the public in the short run, because the primary effects of rent control occur very quickly.
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【多选题】下列有关沥青混合料的性能指标的论述,正确的是( )。
A.
沥青混合料的高温稳定性采用构造深度TD来表征
B.
高温稳定性采用动稳定度指标来表征，其单位是次/mm
C.
表面层的抗滑性能指标可以采用SFC、FB和TD来表达
D.
沥青混合料的水稳定性可以用沥青与石料的黏附性进行衡量
E.
沥青混合料的水稳定性可以用冻融劈裂试验的残留强度比进行判定
【单选题】短语检索也称为词组检索或字符串检索，它是将一个词级或短语用()括起来作为一个独立运算单元，进行严格匹配，以提高检索准确度的一种方法
A.
单引号
B.
中括号
C.
双引号
D.
大括号
【简答题】相机上的“ISO”是指( )
【单选题】关于绝缘安全用具说法,不正确的是( )
A.
电气安全用具分为绝缘安全用具和一般安全防护用具
B.
电气安全用具使用前应进行检查
C.
任何电压下,绝缘手套都作为基本安全用具使用
D.
某些电气安全用具应定期进行电气和机械试验
【多选题】下列有关单个折射球面的正确陈述是
A.
物点发出的同心光束经过单个折射球面后仍为同心光束
B.
若n>n'，则无限远轴上物点对应的共轭像距与曲率半径符号相反（考虑细光束）
C.
若n>n'，则无限远轴上物点经单个折射球面后成虚像（考虑细光束）
D.
若n>n'，则当n'变小时，无限远轴上物点的共轭像点向球面顶点方向移动（考虑细光束）
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