影响嫁接成活的主要因素有()。
A、嫁接的柔和力和生活力(亲和力)
B、植物生长习性
C、外界环境条件
D、接穗的质量
E、砧木生长状况
参考答案:A, D, E
当船舶装载后其重心纵坐标与正浮时浮心纵坐标不同时,船舶将会()。
A.横倾
B.正浮
C.纵倾
D.任意倾斜
— I' m surprised to hear that Sue and Paul have _____.
— So am I. They seemed very happy together when I last saw them. [ ]
A. broken up
B. finished up
C. divided up
D. closed up