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【简答题】
普通晶闸管的图形符号是什么 ,三个电极分别是什么?
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举一反三
【单选题】I_______a doctor now if I had studied medical science in my youth.
A.
were
B.
should be
C.
had been
D.
should have been
【单选题】--The man in a black suit _______ be our youth worker. -- I’m sure it _____ be him. I saw him in the laboratory building some minutes ago.
A.
must; can’t
B.
can; mustn’t
C.
can; could
D.
must; won’t
【单选题】The youth should _____ knowledge thus be well-prepared for their future.
A.
depict
B.
turn around
C.
took place
D.
be armed with
【简答题】硫酸流经由大小管组成的串联管路,硫酸密度为 1830 kg /m 3 ,体积流量为 5.0×10 -3 m 3 /s ,大小管尺寸分别为 Φ 76mm ×4mm 和 Φ 57mm ×3.5 mm ,硫酸在大管中的质量流量是() kg/s 、平均流速是() m/s 及质量流速是() kg/m 2 • s ; 小管中的 质量流量是() kg/s 、平均流速是() m/s 及质量流速是() kg/m ...
【单选题】I know a little bit about the city as I __________ there for one year in my youth.
A.
am studying
B.
had studied
C.
studied
D.
have studied
【简答题】Knowledge in youth is wisdom in age.
【单选题】I wanted to buy a copy of The Youth, but there was left in the bookshop．
A.
no one
B.
something
C.
anyone
D.
None
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