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【多选题】
在降压斩波电路中,E=200V,R=10 Ω ,L很大,反电动势30V,T=50 μ s,ton=20 μ s,输出电压是( )、电流是( )。
A.
80V
B.
100V
C.
8A
D.
5A
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【单选题】The reason he was dismissed is_______he was careless and irresponsible.
A.
because
B.
that
C.
on account of the fact that
D.
since
【单选题】The reason he was late for the gathering is he was caught in a traffic jam
A.
why; because
B.
that; why
C.
that; that
D.
why; that
【单选题】Do you know the reason he was late?
A.
for which
B.
for what
C.
which
D.
that
【单选题】This is the reason he was late for class today.
A.
why
B.
for that
C.
which
D.
that
【单选题】I don’t know the reason he was absent.
A.
why
B.
because
C.
which
D.
as
【单选题】The reason he was late for the gathering is he was caught in a traffic jam.(2018)
A.
why; because
B.
that; why
C.
that; that
D.
why; that
【单选题】车削的英文单词是
A.
drilling
B.
turning
C.
milling
D.
machine
【单选题】成人正常标准视力是
A.
1
B.
1.0-1.5
C.
1.5
D.
0.8
E.
1.2
【单选题】The reason   he was absent from class was   his mother fell ill this morning.A.for; thatB.why; thatC
A.
The reason ____he was absent from class was ____ his mother fell ill this morning. A.for; that
B.
why; that
C.
for; because
D.
why; because
【单选题】He told me the reason he was late for school.
A.
which
B.
why
C.
what
D.
where
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