英语单选15the principal purpose of aviation medicine is _____ by
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英语单选15
the principal purpose of aviation medicine is _____ by people aboard an aircraft in flight
a,to study the stress experienced
b,study the experienced stress
c,to study stress experiencing
d,study the stress experience
the principal purpose of aviation medicine is _____ by people aboard an aircraft in flight
a,to study the stress experienced
b,study the experienced stress
c,to study stress experiencing
d,study the stress experience
A.
C 答案:experiencing by people is not correct.
C 答案:experiencing by people is not correct.
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