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【单选题】
At the end of the cleaning process, the carbon dioxide
A.
is released into the air.
B.
is disposed of with the waste.
C.
is collected ready to be re-used.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】The main stages in aerodynamic design method and process of aircraft include: ____.
A.
The investigation and demonstration
B.
The concept and preliminary design
C.
The wind tunnel test and verification
D.
The flight tests