生态平衡(ecological equilibriuim)
生态平衡(ecological equilibriuim)
生态平衡(ecological equilibriuim)
A.蒸腾作用(transpiration)
B.呼吸作用(respiration)
C.分解作用(decomposition)
D.光合作用(photosynthesis)
A credit to a revenue account______.
A.decreases revenues
B.increases equity
C.decreases equity
D.increases assets
A.Paging companies.
B.Television and radio broadcasts.
C.Computer users.
D.Household equipment.
As the author suggests, resistance stretching is an exercise______.
A.requiring little equipment
B.beneficial to all of us
C.for the strong-willed
D.to test out endurance
射频识别技术(RFID Radio Frequency Identification)实际上是自动识别技术(AEIAutomatic Equipment Identification)在无线电技术方面的具体应用与发展。()
We need to import ______ from abroad.
A.a great deal of equipment
B.many equipments
C.an equipment
D.many pieces of equipments
In what respect was Kohoutek a disappointment?
A.It could be seen only through special equipment.
B.It did not approach the Earth.
C.It did not provide valuable scientific information.
D.It was moving too rapidly for scientists to photograph.
What is the main purpose of the lecture?
A.To discuss recent innovations in laboratory equipment
B.To give an example of a practical use for a particular scientific technique
C.To familiarize students with the chemical composition of paint pigments
D.To show how researchers were able to restore a particular work of art
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