问答题

简述双向脉冲电磁阀的工作原理。

【参考答案】

a.电磁阀1a、1b均失电，静止状态，脉冲阀活塞位于终端位置中的一个；
b.电磁阀1a得电、1b失电或按下手柄K1，停放制动缓解；
c.电磁阀1b得电、1a失电或按下手柄K2，停放制动施加。
<上一题 目录 下一题>
热门 试题

多项选择题
课程结构与课程内容的变革直接改变未来高中生物学科教科书的基本格局。2017版高中生物学新课标指导编写的教材包括A.必修B.选择性必修C.选修D.基础科学
未分类题
回答题。My family and I recently returned from a trip to Alaska, a place that combines supernaturalbeauty with a breathtaking amount of bear risks．I&39; 11 start with some facts at a glance :WHERE ALASKA IS:Way the hell far from you．Beyond Mars．HOW YOU GET THERE:You sit in a variety of airplanes for most of your adult lifE.WHAT THEY HAVE THERE THAT WILL TRY TO KILL YOU:Bears．I am quite serious about this．Although Alaska is now an official state in the United Stateswith modern conveniences such as rental cars and frozen yogurt, it also allows a large number ofadmitted bears to stride freely, and nobody seems to be the least bit alarmed about this．In fact, theAlaskans seem to be proud of it．You walk into a hotel or department store, and the first thing you see is a glass case containing a stuffed bear the size of a real onE.Our hotel had two of thesE.Itwas what we travel writers call a two-bear hotel ．Both bears were standing on their hind legs andstriking a pose that said: Welcome to Alaska! I&39;m going to tear your arms off! This struck me as an odd concept, greeting visitors with a showcase containing a major localhazarD.It&39;s as if an anti-drug organization went around setting up glass display cases containingstuffed drug smugglers(走私者), with little plaques (胸章)stating how much they weighed andwhere they were taken．Anyway, we decided the best way to deal with our fear of bears was to become well informedabout them, so we bought a book, Alaska Bear Tales．Here are some of the chapter titles, which Iam not making up: They&39; ll Attack Without Warning They&39; II Really Attack You They Will Kill Come Quick ! I&39; m Being Eaten by a Bear ! They Can Be Funny Ha-ha! I bet they can．I bet Mr．and Mrs．Bear will fight playfully over the remaining portionof a former tourist plumped up by airhne fooD.But just the same, I&39; m glad that the only actualbears that we saw were in the zoo．What is the tone of the story? 查看材料A.Serious．B.Complex．C.ComiC.D.Disapproving．
A.I&39;
B.Beyond
C.
HOW
D.
WHAT
E.
I
F.Although
G.In
H.You
I.Our
J.Itwas
K.Both
L.It&39;s
M.
Anyway,
N.Here
O.I
P.and
Q.Bear
R.But
S.
What
T.Serious．
B.Complex．
C.ComiC.
D.Disapproving．
相关试题