()can cause oil flow from sludge outlet of self cleaning separator.
A. Too much sludge accumulated in separator bowl
B. Diameter of gravity disc too large
C. High level tank lack of water
D. Oil input too rapidly
在水稻1.5~2.5叶期,喷施()等杀菌剂进行土壤消毒后,再用清水()。
适当的日光照射可以改善____________________和____________________的营养状况,使人____________________。
沙尘暴是指强风从地面卷起大量沙尘,使空气浑浊,水平能见度小于()的灾害性天气现象。