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搜题
【单选题】
稳压二极管工作在什么区域( )。
A.
正偏区
B.
反向截止区
C.
反向击穿区
D.
反偏区
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【判断题】秦代规定每年祭祀八神,月神就是其中之一,称为月主。
A.
正确
B.
错误
【单选题】若把电路中的参考点由原来电位较低的点改选为电位较高的点,则电路中各点的电位比原来
A.
升高
B.
降低
C.
升高或降低
D.
不变
【单选题】若把电路中的参考点由原来电位较低的点改选为电位较高的点,则电路中各点的电位比原来( )
A.
降低
B.
升高
C.
不能确定
D.
不变
【单选题】During the cardiac cycle,
A.
the volume of blood leaving the left side of the heart is greater than that leaving the right side.
B.
the pressure of blood leaving the right side of the heart is greater than that leaving the left side.
C.
the duration of systole is greater than that of diastole.
D.
the duration of diastole is greater than that of systole.
【简答题】秦代规定每年祭祀________,月神就是其中之一,称为月主。
【单选题】During the cardiac cycle of a human adult,
A.
ventricular filling depends mainly on atrial contraction
B.
the ventricle fills fastest during early diastole
C.
the atria and ventricles contract simultaneously during systole
D.
systole is initiated in the left atrium
【单选题】During the cardiac cycle,
A.
the duration of diastole is greater than that of systole.
B.
the volume of blood leaving the left side of the heart is greater than that leaving the right side.
C.
the pressure of blood leaving the right side of the heart is greater than that leaving the left side.
D.
the duration of systole is greater than that of diastole.
【单选题】若把电路中的参考点由原来电位较低的点改选为电位较高的点,则电路中各点的电位比原来( )
A.
改变
B.
不改变
C.
减小为0
D.
不能确定
【单选题】若把电路中的参考点由原来电位较低的点改选为电位较高的点,则电路中各点的电位比原来
A.
升高
B.
降低
C.
升高或降低都可能
D.
不变
【单选题】若把电路中的参考点由原来电位较低的点改选为电位较高的点,则电路中各点的电位比原来( )
A.
降低
B.
升高
C.
不变
D.
不能确定
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