当_____时，大气气团处于稳定状态。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/cfd65918697d4e5aac32ffa652eeeb44.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/3627620c7b20481c9fd4d9816cbe61d3.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/da408a1038da41b2a6f4022dd469857f.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/50437c56e4e340e59d42b59bc26d9802.png">

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/949c4207d8ce434ead55a27b2e057221.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/84be97d812ed4c1283851cf017729ab7.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/c886c8a210284cb48a632c76d95cba59.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/35f5898d11d64c1da936f46eda4c89f3.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/41f30123af76425d80db3d25a3bde229.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/339c278cbea14d3c9a816d7ee03d5ab9.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/e46b21241a7d4fcf9c4d045ae2b02dc9.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/8e27cdc4299841c9945cfcb271bf199e.png

http://image.zhihuishu.com/zhs/onlineexam/ueditor/201705/df3f78163f9a4042b0b493add59751fb.png