His mother is strict _____.[ ]
A. with him
B. with he
C. in him
D. in he
答案:A
按成桩方法分,以下属于非挤土桩的是()。
A、混凝土预制桩
B、沉管灌注桩
C、人工挖孔桩
定位基准的选择原则是什么?