调节基因(regulator,regulatory gene,I)
调节基因(regulator,regulatory gene,I)
调节基因(regulator,regulatory gene,I)
A.Structural genes 结构基因
B.Promoter site 启动子区域
C.Operator site 操作子区域
D.Regulator gene 调节基因
A.机组氧气瓶低压
B.机组氧气瓶超压
C.经过减压阀减压后的氧气压力超过50PSI
D.经过减压阀减压后的氧气压力低于50PSI
According to the doctor, what is the most proper way for the man to keep fit?
A.Going regularly to a gym.
B.Taking the right medicine.
C.Keeping a close watch on his weight.
D.Taking walks regularly.
If a refrigeration compressor will not start, the reason may be _____.
A.the pressure regulating valve is not closing
B.an excessive lack of refrigerant in the system
C.badly leaking discharge valves
D.worn piston rings
A.Most of these accidents are caused by cars.
B.Cyclists are not aware of traffic regulations.
C.Pedestrians often walk on the bicycle lanes.
D.There are too many motorists in the street.
Which of the following probably has the most calories?
A. Strawberry daiquiri. B. Regular beer.
C. Margarita: D. Wine.
He kept in Constant Contact with his family while he was in Australia.
A. gradual
B. regular
C. direst
D. occasional
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