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【多选题】
(多选)如图甲所示,变压器原、副线圈上有L 1 、L 2 、L 3 、L 4 四只灯泡,它们的规格都是“9 V 12 W”,当在该变压器cd端输入交变电压u(ut图象如图乙所示)时,四只灯泡都正常发光,各电表均为理想交流电表。以下说法正确的是( )A.
ab端输入电压的瞬时值表达式为u ab =27·sin100πt(V)
B.
原、副线圈匝数比为3∶1
C.
流过灯泡L 2 的电流方向每秒钟改变50次
D.
电流表的示数为4 A,ab端输入的功率P ab 为48 W
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举一反三
【单选题】Ten years had passed. I found she had ____.
A.
a little white hair
B.
some white hair
C.
a few white hair
D.
a few white hairs
【简答题】微生物包括的主要类群有 微生物、真核微生物和非细胞微生物。
【简答题】Ten years had passed. I found she had ____.A. a
little white hair B. some
white hair C. a
few white hair D. a
few white hairs
【单选题】Ten years had passed. I found she had ______.
A.
few white hair
B.
many white hair
C.
a few white hair
D.
much white hair
【单选题】Ten years had passed. I found she had ______.
A.
a little white hair
B.
some white hair
C.
a few white hair
D.
much white hair
【单选题】Ten years had passed the CCTV event People Who Moved China took place in 2002. [ ]
A.
when
B.
while
C.
before
D.
since
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