题目内容
碳原子的杂化轨道都形成σ键，未参与杂化的p轨道都形成π键。（）
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Besides serving drinks and making sure passengers are comfortable, the flight attendants are also ____ for briefing passengers on emergency procedures, evacuations, and informing the flight crew when problems arise.
The _____ is the Pilot in Command (PIC) who has the final authority of all decisions and all responsibilities rest on his shoulders.
The Captain is the Pilot in Command (PIC) who has the final _____ of all decisions and all responsibilities rest on his shoulders.
Besides serving drinks and making sure passengers are comfortable, the flight attendants are also responsible for ______ passengers on emergency procedures, evacuations, and informing the flight crew when problems arise.
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