减小涡流扩散的方法是
A.选择分子量大的载气
B.填料应均匀
C.填充柱时填充均匀
D.填料颗度要合适
E.减少固定液用量
参考答案:B,C,D
The fact that the miners there work in dreadful attracts the public attention and contribute to making laws to protect the miners’ right .
A.conditions
B.situation
C.atmosphere
D.equipment
.如图所示,甲、乙两表的示数分别是( )
A.0.46A,2.1V
B.0.46A,10.5V
C.2.3A, 2.1V
D.2.3A,10.5V