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【单选题】
直流电动机的定子由机座、( )、换向磁极、电刷装置等组成。A.
主磁极
B.
转子
C.
电枢
D.
换向器
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皮皮学刷刷变学霸
举一反三
【简答题】沉降式离心机包括( )和( )。
【单选题】His father was born in the year when our country .
A.
was built
B.
was set up
C.
was found
D.
was founded
【单选题】When his father was fifteen, he started ________ the national team. [ ]
A.
to play with
B.
to play for
C.
playing with
D.
play for
【简答题】From age of 13 when his father was , he struggled as the for his family. He sold , was and , once came close to death after a drug's .