塑限的含义是指()。
参考答案:土体由半固体状态向可塑性状态过渡的界限含水量
If we had taken such effective ______ much earlier, the river would not be polluted so seriously now.
A.treasures
B.efforts
C.measures
D.actions
花卉盆栽时,选择与准备花盆要注意哪些问题?