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【简答题】
已知A点和B点的直角坐标分别为(1，0，0)与(0，1，1)．线段AB绕Z轴旋转一的旋转曲面为S，求由S及两平面z=0，z=1所围成立体的体积．
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【单选题】There are certain ________ when you must interrupt people who are in the middle of doing something. [ ]
A.
conditions
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situations
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occasions
D.
environment
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【单选题】There are certain ______ when you have to interrupt people who are in the middle of doing something.
A.
chances
B.
situations
C.
occasions
D.
opportunities
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