( ) is a major port of Malaysi
A. George TownB. GdyniaC. Port SaidD. Helsinki
常用电泳仪的电源是
A. λmax<200nm(远紫外区)
B. 200nm左右
C. 200~400nm
D. λmax >210m
E. 100~500V
We must stress that these payment terms ( )very important to us.
A. be
B. being
C. been
D. are
不加黏合剂的硅胶
A. 硅胶H
B. 硅胶HF254
C. 氧化铝H
D. 聚酰胺6
E. SiO2•XH20