煤气管道冷凝水的排放规律是什么?
参考答案:
(1)流量越大,排水越多;
(2)煤气温度越高,排水越多;
(3)直径小,表面积大,排水量较快;
(4)冬多、下少。
My aunt always loses her way when she is out by herself because she has no ________ of direction. [ ]
A. sense
B. feeling
C. touch
D. scene
为什么碱性土壤上植物常发生缺钾现象?