题目内容

城市轨道交通变电所中使用的干式变压器的保护等级一般为IP20，即外壳可防止大于20mm的固定异物进入

A. 对
B. 错

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干式变压器的使用寿命一般为30年~50年

A. 对
B. 错

Inwhichyear,Hanswaschosentocarrytheflagatanationalrally.

A. 1935
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C. 1937
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In,mysteriousanti-NazileafletsbeganappearingalloverMunich.Theyweresigned:theWhiteRose.

A. June1924
B. June1940
C. JuLy1942
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In which year,SophiecametoMunichknowingnothingofherbrother'sactivities.Shesoonencounteredtheleafletsatschool.

A. 1941
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C. 1943
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