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【单选题】
设有关系模式：SC(sno，cno，grade)，各属性含义依次是、课程号、分数。要查询分数低于60分的学生，正确的SQL语句是______。 A) SEI，ECT sno FROM SC WH ERE grade BETWEEN O AND 60 B) SELECT sno FROM SC WHERE grade＜60 C) SELECT sno FROM SC HAVlNG grade BETWEEN O AND 60 D) SELECT sno FROM SC HAVING grade＜60A.
B.
C.
D.
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举一反三
【简答题】平面机构如图所示，杆AB可在套筒C内滑动，曲柄OA绕轴O以匀角速度ω=2.5rad/s在平面内转动。在图示位置试求构件DC的角速度和角加速度。
【单选题】Which of the following can be learned from the text?
A.
People like Lynn Carr's cheesecakes very much.
B.
Lynn Carr's cheesecakes are sold to high school dropouts.
C.
Lynn Carr learned to make cheesecakes by taking courses.
D.
Without finishing high school, one cannot even make good cakes.
【简答题】均质细直杆OA长为ι，质量为m，A端固结一质量为m的小球(不计尺寸)，如图所示。当OA杆以匀角速度ω绕O轴转动时，该系统对O轴的动量矩为( )。
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