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【多选题】
关于电压和电位,以下说法正确的是( )。A.
在研究同一电路系统时， 只能选取一个电位参考点；
B.
在研究同一电路系统时， 可以选取多个电位参考点；
C.
参考点选取不同， 电路中各点的电位也不同， 但任意两点间的电位差（电压）不变；
D.
参考点选取不同， 电路中各点的电位也不同，任意两点间的电位差（电压）也不同。
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【简答题】SDH的映射方法具体包括（）、（）和（）三种类型。
【简答题】SDH 的映射方法具体包括()、()和()三种类型。
【简答题】直线l经过原点，且点M(3,1)到直线l的距离等于3，则直线l的方程为
【单选题】You are starting your college careers at an uncertain time, for this country and for the world. Even so — especially so — I believe you will find MIT an inspiring place to study, to learn and to grow....
A.
You are starting your college careers at an uncertain time, for this country and for the world.
B.
Even so — especially so — I believe you will find MIT an inspiring place to study, to learn and to grow.
C.
MIT is a place of practical optimism and of passionate engagement with the most important problems of the world.
D.
It is a place that is not satisfied until it finds the deepest answers.
【简答题】Time Place Problems Solutions
【简答题】已知直线l经过点A（3，1），并且点P（-1，-2）到直线l的距离为4，求此直线l的方程．
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【单选题】What is the main idea of this paragraph? You are starting your college careers at an uncertain time, for this country and for the world. Even so — especially so — I believe you will find MIT an inspir...
A.
You are starting your college careers at an uncertain time.
B.
MIT an inspiring place to study, to learn and to grow.
C.
MIT is a practical and passsionate place.
D.
MIT is a place that is not satisfied until it finds the deepest answers.
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