简述380V母线失电处理。

Computers_______ many things and we_______ these modern machines.

A．are used to doing; are used to use

B．are used to do; are used to using

C．used to do; are used to using

D．are used to do; used to use

存HBV基因组中最易发生变异的ORF是（）

A.X区

B.P区

C.pre-C基因区

D.C基因区

E.S区

Many lifestyle patterns do such______great harm to health that they actually speed up ______weakening of the human body．

A．a；/
B．/；the
C．a；the
D．/；/

WHO认证体制