Whhich property could be destroyed by the local anesthetics procaine (普鲁卡因).
A、structure integraty
B、insulation
C、infatigable
D、physiological integraty
A、structure integraty
B、insulation
C、infatigable
D、physiological integraty
A.Comets do not contain enough deuterium to have solely created the Earth's oceans.
B.Given the ratio of deuterium to ordinary hydrogen in seawater, comets cannot have contributed to the Earth's oceans.
C.It is likely that comets contain less Xenon than meteorites do.
D.Given the low level of deuterium in the waters of Earth's oceans, comets cannot be its sole source.
E.Comets now play a greater role in the creation of the Earth's oceans than was previously thought.
A、It is the second largest lymphatic duct in human body.
B、Its beginning part shrinks, known as cisterna chyli.
C、It has no communication with right lymphatic duct.
D、Tumor cells in thoracic duct isn't able to enter posterior mediastinal lymph node.
E、When ligating injured terminal part in thoracic duct, lymphedema won't happen.
It is the same in history. Many things have been forgotten because we do not have any written account of them. Sometimes people did keep a record of the most important happenings in their country, but often it was destroyed by fire or in a war. Sometimes there was never written record at all because the people of that time and place did not know how to write. For example, we know a good deal about the people who lived in China 4000 years ago, because they could write and leave written records for those who lived after them. But we know almost nothing about the people who lived even 200 years ago in central Africa, because they had not learned to write.
Sometimes, of course, even if the people can not write, they may know something of the past. For most people can tell proudly what their fathers did in the past. This we may call "remembered history". Some of it has now been written down. It is not so exact or so valuable to us as written history is, because words are much more easily changed when used again and again in speech than when copied in writing. But where there are no written re- cords, such spoken stories are often very helpful.
Which of the following ideas is not mentioned in the passage?
A.Remembered history, compared with written history, is less reliable.
B.Written records of the past play a most important role in our learning of the human history.
C.A written account of our daily. activities helps us to be able to answer any questions.
D.Where there are no written records, there is no history.
— Have you seen the film The Lord of Rings? — Yes. When in the country, I ____ it twice. |
[ ] |
A. saw B. have seen C. had seen D. would seen |
A、neuro-muscular junction.
B、hormone binding with the receptor on the target.
C、classical synapse
D、gap junction
E、varicosity
A、voltage dependent K+ channel.
B、voltage dependent Na+ channel.
C、voltage dependent Ca2+ channel
D、Ach receptor cation channel.
E、chemical dependent Na+ channel.
A、excitation of postsynaptic neuron.
B、caused by interneuron.
C、could be caused by the increase of the K+ conductance on the postsynaptic membrane. u
D、could be caused by the increase of Ca2+ conductance on the postsynaptic membrane.
E、the amplitude is not influenced by the amount of neurotransmitter released from presynatic terminal.
A、membrane depolarization.
B、decrease of the excitatory neurotransmitter released from the presynaptic terminal.
C、exitatory neurotransmitter is catabolized.
D、excitation of the inhibitiory interneuron.
E、excitation of the excitatory interneuron.
A、collateral inhibition
B、reciprocal inhibition
C、presynaptic inhibition
D、feedforward inhibition
E、postsynatic inhhibition
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