皮皮学，免费搜题
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【单选题】
继电保护装置是由 ______ 组成的。A.
(A) 二次回路各元件；
B.
（ B ）测量元件、逻辑元件、执行元件；
C.
（ C ）包括各种继电器、仪表回路；
D.
（ D ）仪表回路。
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举一反三
【单选题】Ihave never seen such a strange animal _______ 3 legs like that.
A.
with
B.
has
C.
on
D.
of
【单选题】I have never seen to lose any weight, _____hard I try. [ ]
A.
even though
B.
no matter how
C.
as if
D.
ever since
【单选题】Dinosaurs have completely died out on the earth, never again. A . to be seen B . being seen C . seen D . seen
A.
to be seen
B.
being seen
C.
seen
D.
having been seen
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