Which of the following do fixed costs involve？ _____.
A. costs of officer and crew
B. loading and unloading costs
C. repair and maintenance expenses
D. administrative costs
She found it difficult to make a ____ for a single-bed room due to the conference
A. selection
B. location
C. reservation
D. conversation
有关全国性的重大政策问题是否只有党中央有权作出决定？
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