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【单选题】
According to the passage, what is the key question for the next century______?A.
How to save as much energy as possible.
B.
How to restrict the use of nuclear energy.
C.
How to provide energy in an environmentally sound way.
D.
How to get alternative way to motor cars.
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举一反三
【单选题】_____supplies pilot air to the control cylinders air start valves.
A.
An air compressor
B.
An indicator cock
C.
An air distributor
D.
A safety valve
【单选题】_____ supplies pilot air to control the cylinder air start valves.
A.
An air compressor
B.
An indicator cock
C.
An air distributor
D.
A safety valve
【单选题】supplies pilot air to the control cylinders of the cylinder air start valves.
A.
An air compressor
B.
An indicator cock
C.
An air distributor
D.
A safety valve
【单选题】_______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
A.
An air receiver
B.
An operating valve
C.
An automatic valve
D.
An air distributor
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