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【多选题】
下列传感器为非接触式传感器的是A.
磁性开关
B.
光电式接近开关
C.
电感式接近开关
D.
管线式接近开关
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反馈参考答案：
举一反三
【简答题】《广艺舟双楫》的作者是？
【简答题】《艺舟双楫》的作者是？
【单选题】He often ______ ping-pong with his friends. Now they ______ ping-pong at school. [ ]
A.
play; are playing
B.
plays; play
C.
plays; are playing
D.
plays; is playing
【单选题】He often practice _____ the piano in his room. [ ]
A.
play
B.
playin g
C.
to play
D.
played
【单选题】He often speaks the role he played in the play, ______ made others upset. [ ]
A.
which
B.
that
C.
where
D.
when
参考解析：
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