They ant to kno hen it ill rain , hen it ill sno and hether their crops may e injured y frost or hail .
她们想懂患上它啥子时辰降雨,啥子时辰下雪,她们的庄稼是不是有可能会被霜,雹子所危险。
By chemical method sno2-ag -- sno 2 bipolar membrance is propered on the carrier of glass andthe condition for the preparation of the membrance and its performance are examined .
