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【单选题】
下列关于E-R模型的叙述中，说法不正确的是( )。A.
在E-R图中，实体类型用矩形表示，属性用椭圆形表示，联系类型用菱形表示
B.
实体类型之间的联系通常可以分为1:1、1:n和m:n三类
C.
1:1联系是1:n联系的特例，1:n联系是m:n联系的特例
D.
联系只能存在于两个实体类型之间
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举一反三
【单选题】To get a pay raise, a person should ________.
A.
advertise himself on the job market
B.
persuade his boss to sign a long-term contract
C.
C) try to get inside information about the organization
D.
D) do something to impress his boss just before merit pay decisions
【单选题】If I don't _____ for that job, bang goes my holiday in France. [ ]
A.
get pay
B.
get paid
C.
get to pay
D.
get paying
【单选题】各专业工作队按照一定的施工顺序投入施工,各专业工作队在各施工对象上连续、有节奏地施工,并作最大限度搭接的施工组织方式是:
A.
依次施工
B.
平行施工
C.
搭接施工
D.
流水施工
【单选题】The speaker had to get his voice ________ so as to make himself ________. [ ]
A.
risen; hearing
B.
raised; hearing
C.
raised; heard
D.
arisen; heard
【单选题】To get a pay raise, a person should_____________.
A.
advertise himself on the job market
B.
persuade his boss to sign a long-term contract
C.
try to get inside information about the organization
D.
do something to impress his bossjust before merit pay decisions
【简答题】仙人掌生活在缺水的沙漠中,在仙人掌细胞中含量最多的有机物是( ) A.水 B.蛋白质 C.脂质 D.糖类 2.下列关于微量元素的叙述,错误的是 ( ) A.微量元素是细胞中含量很少的元素 B.微量元素的含量越多对生物体的生命活动就越有利 C.微量元素是维持正常生命活动不可缺少的元素 D.Mn、B、Mo都属于微量元素 3.人是杂食动物,通过摄入动植物及其产物来获得化合物和元素,则人体...
【单选题】He had wanted a 25% raise in pay, but after talking to his boss, he decided that a 5% raise would have to______.
A.
suffice
B.
satisfy
C.
gratify
D.
delight
【简答题】无论哪一种继承权限,其基类的________成员均不能为派生类所继承。
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