皮皮学，免费搜题
登录
搜题
【简答题】
直流电动机的旋转方向取决于 ( ) 。改变电枢电流的方向或主磁极的磁通方向,即可使电动机 ( ) 。直流电动机调速方法有三种: 1)( )(2)( )(3)( )。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Fortunately he will go on holiday in place of Brown ．
A.
．不填； the
B.
．不填；不填
C.
．不填； a
D.
． the ；不填
【单选题】The State Secretary ______to newsmen that an immediate agreement in the Middle East was nowhere in sight .
A.
confessed
B.
concurred
C.
admitted
D.
conceded
【单选题】The president of the country ______ him to be the Secretary of State.
A.
elected
B.
nominated
C.
voted
D.
notified
【单选题】When Secretary of State Condoleezza Rice stood beside Afghan President Hamid Karzai, she made an enlightened statement about cutting Afghanistan' s opium production, saying: 'It is a problem that took...
A.
Opium is closely related with the economy situation of Afghanistan people.
B.
It is a hard job which needs time.
C.
Afghanistan is not a democratic country.
D.
It is a problem left by history and it need more patience.
【简答题】A．Especially B．Probably C．Suddenly D．Fortunately
【单选题】听力原文： Secretary of State, Warren Christopher, has wrapped up his latest trip to the Middle East, saying the peace process is progressing. Mr. Christopher says he will leave the region Thursday, assure...
A.
believes there is hope for peace.
B.
will report to the UN on Thursday.
C.
will hold more talks before leaving the region.
D.
is not sure that the peace process will succeed.
【单选题】When Secretary of State Condoleezza Rice stood beside Afghan President Hamid Karzai, she made an enlightened statement about cutting Afghanistan’s opium production, saying: 'It is a problem that took ...
A.
Opium is closely related with the economy situation of Afghanistan people
B.
It is a hard job which needs time
C.
Afghanistan is not a democratic country
D.
It is a problem left by history and it need more patience
相关题目：