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【多选题】
下列关于变形缝的做法，表述错误的是( )。A.
伸缩缝要从基础顶面开始，将墙体、楼板、屋顶全部断开
B.
屋顶部分需另做伸缩缝
C.
伸缩缝只设在墙、楼地面、屋顶上，基础不设缝
D.
沉降缝则从屋顶到基础，全部构件部位均需设缝分开
E.
防震缝与沉降缝结合设置时，基础不应分开
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【简答题】 在单相桥式整流电路中,变压器次级电压 V 2 =120V (见下图),在未接滤波电容 C 时负载两端电压 V L 是多少伏?加了滤波电容并在空载情况下输出的直流电压最大值可达多少伏,此时整流二极管实际承受的反向电压是多大?
【单选题】The example of the man shows an ability to ______.
A.
avoid traffic accidents
B.
judge the good and evil of a person
C.
know about the events that are happening some distance away
D.
sense a danger that will actually happen later on
【简答题】在单相半波、单相桥式整流电路中,加滤波电容和不加滤波电容两种情况下,二极管承受的反向工作电压有无区别?为什么?
【单选题】在单相桥式整流、电容滤波电路中，下列说法正确的是（ ）。【图片】
A.
二极管承受反向电压最大值为输入电压的最大值
B.
若电容为电解电容，其极性应与输出电压极性相反
C.
电路输出电压的最大值为输入电压的有效值
D.
当电容C开路时，各二极管的导通角不变
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【简答题】A．It can affect the ability of finding information. B．It decides the ability of reading newspaper. C．It can affect the ability to earn a living. D．It decides the pleasure of reading.
【单选题】A set of genes play a role in learning to read and do math, but this ability is not just gene-driven,【C1】______schooling and help from parents are also vital【C2】______. Early mathematical ability and ...
A.
as
B.
so
C.
though
D.
if
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