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【单选题】
1变频器的调压调频过程是通过控制( )进行的。A.
载波
B.
调制波
C.
输入电压
D.
输入电流
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皮皮学刷刷变学霸
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【单选题】Peter was so angry at all ____ Mary was doing ___ he walked out.
A.
what; as
B.
what; that
C.
that; which
D.
that; that
【单选题】Mary went to the booking-office at lunch time, but all the tickets _____ out. [ ]
A.
would sell
B.
was selling
C.
had sold
D.
have sold
【单选题】Mary went to the box office at lunch time, but all the tickets __________ out.
A.
would sell
B.
had been sold
C.
have been sold
D.
was selling
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A.
社区卫生服务中心是社区卫生服务机构网络的构成主体
B.
社区卫生服务站不需要在中心的统一组织下开展工作
C.
老年健康服务机构属于社区卫生服务机构
D.
社区卫生服务站不具备完整的“六位一体”功能
【单选题】Mary was out all night and her parents kept asking her where she______.
A.
was
B.
is
C.
had been
D.
has been
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