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【单选题】
在开关电器中，气体吹动电弧的方法为纵吹时，气体吹动方向与电弧轴线相（）。A.
平行
B.
垂直
C.
倾斜30°角度
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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】She broke into(teal')__________when she heard the news that her son was badly injured．
【单选题】Lucy looks ________when she performs. [ ]
A.
strongly
B.
beautifully
C.
wonderfully
D.
beautiful
【单选题】理想变压器的电压变比关系描述正确的是:
A.
输入电压和输出电压之比，等于原副线圈的比值，两者同相位
B.
输入电压和输出电压之比，等于原副线圈的比值，两者位相差为 π/2
C.
输入电压和输出电压之比，等于原副线圈的比值，两者位相差为- π/2
D.
输入电压和输出电压之比，等于原副线圈的比值，两者位相差为 π
【单选题】She said to her son, “Don’t play in the street.”
A.
She said to her son that he didn’t play in the street.
B.
She told to her son not to play in the street.
C.
She told her son that he didn’t play ion the street.
D.
She told her son not to play in the street.
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