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【多选题】
引起变压器火灾的主要原因是（）.A.
绕组匝间、层间或相间绝缘损坏发生短路，造成绕组发热、燃烧；
B.
间绝缘或与夹紧螺栓间绝缘损坏，引起涡流损耗增加，温度上升，可使绝缘油分解燃烧；
C.
绕组及分接头引线连接点接触电阻过大，引起高温起火；
D.
绝缘油老化、变质、杂质过多，引起耐压等级下降，发生闪弧；
E.
变压器渗漏油引起油面下降，散热作用减少引起绝缘材料过热和燃烧；F、变压器外部线路短路，严重过负荷而保护又拒动，也会引起内部起火、爆炸；
F.
短路或过负荷。
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【简答题】The
pilot lost contact with the military base, ___ the plane crashed in the desert.A. by
means of which B. for
which C. among
which D. as
a result of which
【单选题】The pilot lost control with the military base, the plane crashed in the desert.
A.
by means of which
B.
for which
C.
in case of which
D.
as a result of which
【单选题】The wing of the plane in mid-air and the plane crashed.
A.
broke in
B.
broke back
C.
broke out
D.
broke away
【简答题】A．All the passengers were killed. B．The plane crashed in the night. C．No more survivors have been found. D．It's too late to search for survivors.
【单选题】The pilot lost contact with the military base,______the plane crashed in the desert.
A.
among which
B.
for which
C.
by means of which
D.
as a result of which
【单选题】The pilot lost contact with the military base,______the plane crashed in the desert.
A.
by means of which
B.
for which
C.
among which
D.
as a result of which
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