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【简答题】
试概述转速单闭环调速系统的主要特点。对于转速单闭环直流调速系统来说，改变给定电压是否能够改变电动机的转速？为什么？如果给定电压不变，调整反馈电压的分压比，是否能够改变转速？为什么？如果测速发电机励磁发生变化，系统有没有克服这种扰动的能力？
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举一反三
【单选题】What will happen to the workers if the machines are painted gray compared with orange?
A.
Workers may be more cheerful and energetic.
B.
More errors and accidents will occur.
C.
There is no difference at all.
D.
They will be more active and curious.
【单选题】All the machines in the lab are ____ Miss White.
A.
in charge of
B.
in the charge of
C.
under the charge of
D.
under charge of
【简答题】阅读理解。 Two years ago my husband bought me a bicycle. If you live in a city, it is often faster than a car and you don't have to worry about parking (停车). You can leave it anywhere. As it has a seat at ...
【单选题】The car ______ my aunt bought was destroyed by her husband. [ ]
A.
who
B.
whose
C.
which
D.
what
【单选题】—What are you looking for? —I'm looking for the ring _____ my husband bought me last year. [ ]
A.
that
B.
who
C.
whom
D.
it
【简答题】RNA与DNA在结构上的差别?
【单选题】关于蠕虫蚴移行症的概念描述下列哪项是正确的
A.
肝、肺、脑等器官可造咸肉芽肿损害
B.
蠕虫蚴在人体内易发育为成虫
C.
该症可引起多种器官损害，其中以脑和肝部病变较多
D.
粪便检查可见虫卵即可确诊
E.
蠕虫的幼虫在人体内移行而不寄生
【单选题】The book _______ my husband bought in Shenzhen yesterday was very interesting.
A.
who
B.
where
C.
when
D.
which
【单选题】关于蠕虫蚴移行症的概念描述下列哪项是正确的
A.
肝、肺、脑等器官可造成肉芽肿损害
B.
蠕虫蚴在人体内易发育为成虫
C.
该症可引起多种器官损害，其中以脑和肝部病变较多
D.
粪便检查可见虫卵即可确诊
E.
蠕虫的幼虫在人体内移行而不寄生
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