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【简答题】
彩色涂层钢板有哪几种？主要应用于何处？有哪些优点？
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举一反三
【单选题】We advised them to take a rest, but they ______ on finishing the work.
A.
suggested
B.
continued
C.
insisted
D.
persisted
【单选题】In order to keep error to a minimum，we are advised to_________．
A.
separate our emotions from what we see
B.
improve our memory of what we see
C.
get a better look at what we are interested in
D.
concentrate on what makes US relaxed
【简答题】We advised them to take a rest, but they _____________ on finishing the work. [A] suggested [B] continued [C] insisted [D] persisted
【单选题】The problem is _______ we can arrive there before 6:00 tomorrow morning.
A.
which
B.
whether
C.
when
D.
that
【简答题】常用的铁氧体软磁材料有哪些?它们各自有什么特点,分别有哪些应用?
【单选题】To correct the problem the author discusses we are advised to__________ 查看材料
A.
stop being so insecure towards children
B.
let children play more
C.
study the roots and effects of our fear
D.
stop regulating children's lives
【单选题】Cinnamon Buns Co. (CBC) started 2018 with $52,000 of merchandise on hand. During 2018, $280,000 in merchandise was purchased on account with credit terms of 2/10, n/30. All discounts were taken. Purch...
A.
$312,480.
B.
$326,000.
C.
$331,480.
D.
$337,000.
【简答题】铁磁材料的特点有哪些?
【单选题】In order to keep error to a minimum，we are advised to_________． 查看材料
A.
separate our emotions from what we see
B.
improve our memory of what we see
C.
get a better look at what we are interested in
D.
concentrate on what makes US relaxed
【多选题】为了达到“故障-安全”要求,安全型继电器在结构上有哪些特点?
A.
前接点采用熔点高，不会因熔化而使前接点粘连的导电性能良好的材料。
B.
增加衔铁重量，采用“重力恒定”原理在线圈断电时强制将前接点断开。
C.
采用剩磁极小的铁磁材料构成磁路系统，并在衔铁与极靴之间设有一定厚度的非磁性止片，当衔铁吸起时仍有一定的气隙以防剩磁吸力将衔铁吸住。
D.
衔铁不致因机械故障而卡在吸起状态。
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