医学节肢动物防治的治本措施是（）。

A.化学防制

B.环境治理

C.物理防制

D.生物防制

E.遗传防制

Software document is an important part of software and a basis of software's development phase. It also influnces software's

A．Reusability

B．Maintanence

C．Expansibility

D．Portability