选择题:Had you come five minutes earlier, you _________ t

题目内容:
Had you come five minutes earlier, you _________ the train to Birmingham. But now you missed it.
选择一项:
A.

could catch
B.

would catch
C.

would have caught
参考答案:

公共行政中的最基本和最重要的原则性理念是

公共行政中的最基本和最重要的原则性理念是A.行政效率观B.行政法治观C.行政伦理观D.行政权力

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[综合题,6.6分] 求旋转抛物面z=x2+y2及平面z=1所围成的质量均匀分布的物体的形心.

[综合题,6.6分] 求旋转抛物面z=x2+y2及平面z=1所围成的质量均匀分布的物体的形心.

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