Tenax-TA吸附管使用前应通氮气活化,活化温度要()解吸温度。
A、低于;
B、高于;
C、等于;
D、无所谓。
参考答案:B
--- I am going to Hawaii with my aunt this month for my holiday.
---- __________ !
A.Have a good time.
B.Best wishes to them .
C.Thank you very much.
D.It' s OK
下面哪几条措施能防止数据泄漏()
A.数据冗余
B.数据加密
C.访问控制
D.密码系统