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【单选题】
下面关于在绘制模型图时要注意的事项说法错误的是______。 A) 实体集的名称和编号写在矩形框(或圆角矩形框)外的下面 B) 非主属性也可以写在矩形框(或圆角矩形框)内水平线的下面 C) 主码属性写在矩形框(或圆角矩形框)内水平线的上面并用“PK”标注 D) 外码属性写在矩形框(或圆角矩形框)内水平线的下面并用“FK”标注A.
B.
C.
D.
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【单选题】在一定温度下,等体积的甲醛( HCHO)溶液和葡萄糖(C 6 H 12 O 6 )溶液的渗透压相等,溶液中甲醛和葡萄糖的质量比是( )
A.
6:1
B.
1:6
C.
1:3
D.
3:1
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【简答题】When we talk about stars ,especially women stars ,it seems that they are always young, pretty and own charming body shapes. But recently a Britain's Got Talent（英国达人）star Susan Boyle has changed our vi...
【判断题】D It will be cloudy in Shanghai tomorrow. The temperature will be as high as 31°C. It will be very warm. You can wear your skirt. A light rain is going to fall in Lhasa tomorrow afternoon. When you go...
A.
正确
B.
错误
【简答题】It will be cloudy in Shanghai tomorrow. The temperature will be as high as 31°C. It will be very warm. You can wear your skirt. A light rain is going to fall in Lhasa tomorrow afternoon. When you go o...
【多选题】下列说法正确的是______。
A.
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B.
由于高压汞灯点燃后灯管两端电压高,故称“高压”
C.
汞氙灯一般用作探照灯
D.
汞氙灯一般用作航行灯
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【单选题】在一定温度下,等体积的甲醛( HCHO)溶液和葡萄糖(C 6 H 12 O 6 )溶液的渗透压相等,溶液中甲醛和葡萄糖的质量比是( )
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