I have three friends. Let's ____ to meet them. [ ]
A. goes
B. go
C. to go
D. going
答案:B
参与识别转录起点的是()
A、ρ因子
B、核心酶
C、引物酶
D、σ因子
煅淬法的注意事项有()
A.反复几次
B.辅料应吸尽
C.全部酥脆为止
D.煅时不能搅拌
E.煅红趁热淬