题目内容

【题目】读“昆明准静止锋示意图”，回答下列各题。

【1】此锋面形成的季节多在（ ）

A．春季 B．夏季 C．秋季 D．冬季

【2】此时贵阳附近的天气特征是（ ）

A．阴雨连绵 B．晴空万里 C．大雪纷飞 D．暴风骤雨

【3】据图分析昆明准静止锋的成因主要是（ ）

A．暖气团势力强 B．冷气团势力强

C．地形影响 D．海陆位置影响

【答案】

【1】D

【2】A

【3】C

【解析】

试题分析：

【1】读图，此锋面是准静止锋，冷暖气团势力相当。结合纬度分析，该地位于云贵高原地区，纬度较低，冬季冷空气南下，受地形阻挡，与南方的暖空气相持不下准静止锋，形成的季节多在冬季，D对。其它季节冷空气势力弱，加上沿途地形阻挡，对该地影响小，不能形成准静止锋，A、B、C错。

【2】据图分析，此时，贵阳位于冷空气一侧，冷锋降雨在锋后，暖锋降雨在锋前，即冷空气一侧是雨区。此时正值冬季，所以贵阳附近的天气特征是阴雨连绵，A对，B错。该地纬度低，没有大雪纷飞天气，C错。暴风骤雨天气出现在夏季，D错。

【3】据图分析，昆明准静止锋的成因主要是地形影响，冷空气受地形阻挡，不能继续南下，与暖空气相持不下，形成准静止锋，C对。 暖气团势力强形成暖锋，冷气团势力强形成冷锋，A、B错。两地的海陆位置影响不大，D错。

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