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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.
相关题目：
【单选题】细胞间结冰伤害的主要原因（）
A.
原生质过度脱水
B.
机械损伤
C.
膜伤害
【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.
【单选题】北京市沙尘暴的沙尘主要来源是（ ）
A.
河北
B.
内蒙古
C.
辽宁
D.
江苏
【单选题】遇有（）及以上风或暴雨、雷电、冰雹、大雪、大雾、沙尘暴等恶劣气候时，应停止露天高处作业。
A.
五级
B.
六级
C.
七级
D.
八级
【单选题】在浮子式汽化器系统中，汽化器容易结冰的原因是（）。
A.
汽化器内容易吸入冰粒
B.
已到结冰温度的空气进入汽化器
C.
汽化器内燃油的蒸发和空气的膨胀降温
【单选题】我国河流有无结冰期的分界线是（）
A.
长江
B.
秦岭—淮河
C.
黄河
D.
珠江
【判断题】冰比水的密度大，水结冰后体积要增大。
A.
正确
B.
错误
【判断题】水结冰时体积膨胀，所以冰的密度比水的密度小，能浮在水面上。()
A.
正确
B.
错误
【单选题】严重危害飞行安全的冰雹，通常与下列何种云有联系（）
A.
普通雷暴云
B.
强烈雷暴云
C.
堡状高积云
【单选题】93沙尘率三级过滤总成滤情效率为≥（）。
A.
99.5
B.
99.6
C.
99.7
D.
99.8
【单选题】下列制导武器中容易受到沙尘云雾天气影响的是( )。
A.
激光制导的导弹
B.
雷达制导的导弹
C.
GPS制导的导弹
D.
有线制导的导弹
【单选题】冰雹的定义是什么？（）
A.
水或冰在空中凝结再落下的自然现象
B.
球状或形状不规则的固态降雨
C.
地球表面水蒸发上升遇冷形成了雨
【单选题】北京多沙尘暴，沙尘的主要来源是[ ]
A.
B.
内蒙古
C.
辽宁
D.
河北