A) Acetylene
B) Alkenes
C) Alkynes
D) Methane
A) Acetylene
B) Alkenes
C) Alkynes
D) Methane
A.such artifacts frequently exceed in quality those already catalogued in museum collections
B.such artifacts seldom have scientific value
C.there is likely to be a continuing supply of such artifacts
D.museums are well supplied with examples of such artifacts
A、flipped
B、turned
C、made
D、pressed
A、What are the most efficient energy-saving measures of air-conditioning systems in public places?
B、Nuclear fission reactors should be deployed and used to generate electricity from nuclear fuel for civilian purposes.
C、Solar power provides an alternative to conventional energy resources.
D、America’s anti-pollution efforts should focus on privately owned hybrid cars.
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