【单选题】采用溶剂极性递增的方法进行活性成分提取,下列溶剂排列顺序正确的是()
A.
C6H6、CHCl 3、AcOEt、Me2CO、EtOH、H2O
B.
H2O、AcOEt、EtOH、Me2CO、CHCl3、C6H6
C.
C6H6、CHCl3、Me2CO、AcOEt、EtOH、H2O
D.
H2O、AcOEt、Me2CO、EtOH、C6H6、CHCl3
E.
CHCl3、AcOEt、C6H6、Me2CO、EtOH、H2O
【单选题】WHAT IS TRUE CONCERNING PHYSICAL AND LOGICAL TOPOLOGIES?
A.
Logical topologies refer to how a network transfers data between devices.
B.
Physical topologies display the IP addressing scheme of each network.
C.
The logical topology is always the same as the physical topology.
D.
Physical topologies are concerned with how a network transfers frames.
【简答题】A.lawful B.historical C.natural D.logical
【单选题】以下所列药物中,推荐用于治疗三叉神经痛者的首选处方药是
【单选题】以下所列药物中,推荐用于治疗三叉神经痛者的首选药物是