听力原文:M: Where did you and Tom go on vacation? W: We spend three days in Scotland, one week in Spain, and five days in Switzerland. Q: Which of the following countries was not mentioned? (2)
A.
Spain.
B.
Sweden.
C.
Scotland.
D.
Switzerland.
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【单选题】Which of the following statements about theoretical capacity is BEST?
A.
Theoretical capacity allows adjustments for preventive maintenance.
B.
Running a factory at this level for a short time is often better than permanently raising resource levels.
C.
Theoretical capacity levels are usually lower than rated capacity levels.
D.
Theoretical capacity levels take into account that machines occasionally break and that workers occasionally call in sick.