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【简答题】
数控系统的伺服一般都采用三环结构,外环为(-----),中环为速度环,内环为电流环。
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皮皮学刷刷变学霸
举一反三
【单选题】-Dongdong, ____ car is that? -It's ____. [ ]
A.
who's; her
B.
whose; mine
C.
whose; her
D.
who's; my
【单选题】— Dongdong, ____ toy car is that? — It’s ____.
A.
who’s; her s
B.
whose; mine
C.
whose; her
D.
who’s; my
【单选题】— Listen, what's the noise? — My father ____ the programme of the World Cup. [ ]
A.
watches
B.
has watched
C.
is watching
D.
will watch
【单选题】— Dongdong，__________ toy car is that? — It’s _________．
A.
who’s；hers
B.
whose；mine
C.
whose；her
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