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深铁运营管辖范围内发生台风、暴雨、冰雹、雷电、大雾等气象灾害的主要危害均有（ ）
A.
高处坠落
B.
淹溺
C.
触电
D.
行车安全
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【单选题】For the (26) month, mysterious falls of large chunks of ice (冰雹) (27) rained down on Spain and Italy. Juana Sanchez, a 70-year-old woman in Almeria, southern Spain, was knocked (28) when she was struc...
A.
Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account (44) the ice, scientists had to come up with a rationalization. Professor Jesus Martinez Frias, the geologist investigating the ice falls in Spain, told BBC News that the ice pieces had probably been (45) through sudden temperature drops in the stratosphere. This was the most likely explanation, he said, for the "very unusual" phenomenon.
【简答题】（本小题满分12分）已知向量 ,向量 与向量 夹角为 ，且 ．(1)求向量 ；(2)若向量 与向量 的夹角为 ，其中 ， B， 为 的内角，且 ， ， 依次成等差数列，试求| |的取值范围。
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【单选题】For the (26) month, mysterious falls of large chunks of ice (冰雹) (27) rained down on Spain and Italy. Juana Sanchez, a 70-year-old woman in Almeria, southern Spain, was knocked (28) when she was struc...
A.
Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account (44) the ice, scientists had to come up with a rationalization. Professor Jesus Martinez Frias, the geologist investigating the ice falls in Spain, told BBC News that the ice pieces had probably been (45) through sudden temperature drops in the stratosphere. This was the most likely explanation, he said, for the "very unusual" phenomenon.
【简答题】（本小题满分12分）已知向量 ,向量 与向量 夹角为 ，且 ．(1)求向量 ；(2)若向量 与向量 的夹角为 ，其中 ， B， 为 的内角，且 ， ， 依次成等差数列，试求| |的取值范围。
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