题目内容
（请给出正确答案）
[主观题]
Which is the advantage of bottom-up budgeting？
A、Frees up senior management resource.
B、Senior managers retain control.
C、Budget setting process can be quicker.
D、Avoids the problem of bad decisions from inexperienced managers.
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V工作的X射线管，所产生的连续谱最短波长为 _____ 纳米？
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