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【单选题】
If he couldn’t keep the terms of the contract, John shouldn’t have signed it--I don't see how we can get him __off_the_hook__ now.A.
to erase the signature
B.
to adhere to the terms
C.
to be free from trouble
D.
to be out of the control
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【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
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