由题意得:3x-6≥0,
解得:x≥2,
故选:B.
Being a teacher always encouraging students to think for themselves, I won't tell them answers until they __________ on a math problem for more than an hour.
A.have worked
B.will have worked
C.will have been working
D.had worked
简述反不正当竞争法归属于知识产权法律体系的原因。