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【简答题】
On Christmas Eve, the night before Christmas Day, children all over Britain put a stocking at the end of their beds before they go to sleep. Their parents usually tell them that Father Christmas will come during the night. Father Christmas is very kind and hearted. He gets to the top of each house and climbs down the chimney into the fireplace. He fills each of the stockings with Christmas presents. Of course, Father Christmas isn't real. In Jim and Kate's house, "Father Christmas" is really Mr Green. Mr Green doesn't climb down the chimney. He waits until the children are asleep. Then he quietly goes into their bedrooms and fills their stockings with small presents. When they were very young, Mr Green sometimes wore a red coat. But he doesn't do that now. The children are no longer young, and they know who "Father Christmas" really is. But they still put their stockings at the end of their beds.
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【单选题】血中主要运输形式胆红素是()
A.
胆红素葡萄糖醛酸酯
B.
胆红素-白蛋白
C.
胆素原
D.
胆红素-γ蛋白
E.
胆红素-阴离子
【简答题】半导体中的载流子有 ______ 与 _______ 两种,载流子的运动方式 有 运动和 运动 两种。
【多选题】无限大功率电源的特点是( )
A.
容量为无限大
B.
阻抗等于零
C.
端电压不变
D.
频率保持不变
【简答题】无限大功率电源的特点是什么?
【简答题】无限大功率电源的特点是什么?无限大功率电源供电情况下,发生三相短路时,短路电流中包含有哪些电流分量,这些电流分量的变化规律是什么?
【简答题】半导体中载流子的运动方式有 运动和 运动两种。
【单选题】下列哪一个不是无限大功率电源的特点
A.
端电压保持恒定
B.
电源电流保持恒定
C.
没有内部阻抗
D.
功率无限大
【简答题】无限大功率电源的特点是什么?在什么情况下可以将实际电源视为无限大功率电源?
【多选题】好的子程序的名字有哪些特点()
A.
使用有意义、清晰且表述清楚的动词+目标的方式
B.
仅通过数字来形成不同的子程序的名字,比如1(),2()
C.
根据需要确定子程序名字合适的长度,范围在9-15个字符
D.
对整个程序的子程序命名做统一的命名规范
【单选题】不属于无穷大电源特点的是( )。
A.
电压恒定
B.
电流恒定
C.
功率无限大
D.
频率恒定
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