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【单选题】
真空断路器灭弧室的玻码外壳起( )作用。A.
党史密封
B.
密封
C.
绝缘
D.
真空密封和绝缘双重
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】数学物理方程练习2.png
【单选题】The gir l ______ an English song in the next room is Tom ’ s sister.
A.
w ho i s singing
B.
is singing
C.
sang
D.
was singing
【简答题】数学物理方程练习5.png
【单选题】—Ssh, be quiet! The baby _____ in the ne xt room. —Oh, sorry. [ ]
A.
sleeps
B.
slept
C.
is sleeping
D.
was sleeping
【单选题】—Listen! Kathy is playing the piano in the next room. —It ______ not be Kathy. She called me on the way to the post office just now. [ ]
A.
can
B.
must
C.
need
D.
shall
【简答题】数学物理方程练习7.png
【简答题】数学物理方程练习8a.png
【简答题】数学物理方程练习4.png
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