一种介于关系代数和关系演算之间的语言叫做______。

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问题:

一种介于关系代数和关系演算之间的语言叫做______。

考点:计算机等级考试数据库技术三级数据库技术笔试
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一份调查问卷由一系列通常为防止或检测每种类型的交易中可能发生的错误和舞弊所需的控制有关的问题组成。以下哪项不是这样一份调查问卷的优点()

A.调查问卷提供了一个尽可能减少忽视内部控制各方面可能性的框架。

B.调查问卷容易完成。

C.调查问卷在设计和应用上具有灵活性。

D.完成了的调查问卷提供了内部审计师熟悉内部控制的证明文件。

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    Plants are very important. This is because plants can make food from air, water and sunlight. Animals and man cannot make food from air, water and sunlight. Animals can get their food by eating plants and other animals. Man gets his food by eating plants and animals, too. So animals and man need plants to live. This is why there are so many plants around us.

There are two kinds of plants: flowering plants and non-flowering(无花) plants. Almost all the trees around us are flowers and fruit. Non-flowering plants don’t grow flowers. You can’t see many non-flowering plants around you.

If you look carefully at the plants around you, you’ll find that there are many kinds of plants. Some plants are very big and some very small. Most of them are green. We can live on the earth because of the plants around us.

小题1:Which of the following is the most important according to the passage?

A.Man.

B.Plants.

C.Animals.

D.Air, water, and sunlight.小题2: We need many plants around us because _______ .

A.plants can grow easily

B.plants are green

C.we can get what we need from plants

D.we like all kinds of plants小题3:There are ______ non-flowering plants than flowering plants around us.

A.much fewer

B.much more

C.much larger

D.much better小题4:Which of the following doesn’t come from a plant?

A.Basket.

B.Bread.

C.Cabbage.

D.Stone Forest小题5:The best title(标题)for this passage may be _________ .

A.Food from Plants

B.Plants Make Food

C.Man and Animals

D.Plants around us

题型:填空题

患者女性,30岁。于家中发现步态不稳,言语不清,无任何气味,怀疑中毒,可能为()

A.CO中毒

B.酒精中毒

C.安眠药中毒

D.食物中毒

E.有机磷中毒

题型:填空题

男性,54岁,乙肝病史10年,1个月来乏力腹胀,双下肢水肿,1周来自觉低热、乏力、腹胀日益加重,腹痛。查体:移动性浊音(+)。腹水检查:李凡它试验(+),细胞数0.8×109/L,WBC0.6×109/L,中性90%。

首选的检查为()

A.心电图

B.心脏常规拍片

C.心肌酶谱

D.胸片

E.超声

题型:填空题

以下不用作比喻义的是()

A."故为者如牛毛,获者如麟角也"的"麟角"

B."况无锱铢之来,而有千百之往乎"的"锱铢"

C."若令服食终日,则肉飞骨腾"的"肉飞骨腾"

D."自役过差,百病兼结,命危朝露"的"朝露"

E."虽身枯于流连之中,气绝于纨绮之间"的"纨绮"

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