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【简答题】
关系R的属性A参照引用关系T的属性A,T的某条元组对应的A属性值在R中出现,当要删除T的这条元组时,系统可以采用的策略包括拒绝执行、 、设为空值。
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举一反三
【简答题】If we try to divide the text into three parts, the first part would be __________ paragraph(s), the second part would be ________ paragraph(s), the third part would be __________ paragraph(s). (文章每段左上...
【简答题】选择词组填空 draw a conclusion  expose…to   lose sight of  run out of  be addicted to   on the whole  divide… 1. Don't _________ yourself________ strong sunlight; it will harm your skin. 2. Wang Ping ran ve...
【简答题】马克思指出:“蝴蛛的活动与织工的活动相似,蜜蜂建筑蜂房的本领使人间的许多建筑师感到惭愧。但是,最蹩脚的建筑师从一开始就比最灵巧的蜜蜂高明的地方,是他在用蜂蜡建筑蜂房以前,已经___ 中把它建成了。”
【简答题】After reading text A, you can find that the type of this passage is _________. And it should include five basic elements of plot structure: exposition (开端), rising action (上升), turning point (转折), fal...
【单选题】关于泵的总效率下列说法中不准确的是________。
A.
有效功率与轴功率之比
B.
输出功率与输入功率之比
C.
实际输出的液体所得功率与输入功率之比
D.
传给液体的功率与输入功率之比
【单选题】Please try to divide the text into three parts. 请尝试把文章分为三个部分。
A.
Para 1---para 2.3.4.5---para 6
B.
Para 1.2---para 3.4---para 5.6
C.
Para 1---para 2.3.4---para 5.6
【简答题】What is the key word of this passage? 2. Try to divide the passage into several parts.
【单选题】关于泵的总效率下列说法中不准确的是
A.
有效功率与轴功率的比
B.
输出功率与输入功率之比
C.
实际输出的液体所得功率与输入功率之比
D.
传给液体的功率与输入功率之比
【简答题】Please read the text fluently and try to summarize or retell each part in your own words. P.S. Record your voice. You may divide your recording information into three parts (1-2; 3-12; 13).
【简答题】Complete the sentences with words or phrases given in the box below. Make changes where necessary. classify divide group sub-categorize base category ...
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