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【单选题】
以下关于 VLAN 概念的描述中,错误的是A.
VLAN是一种新型的局域网
B.
建立VLAN需要使用交换机
C.
VLAN以软件方式来实现逻辑工作组的划分与管理
D.
逻辑工作组中的节点组成不受物理位置限制
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【简答题】some of which were【L14】______.
【单选题】If Slovenia were a large country in world trade, then if it instituted a large set of subsidies for its exports, this must ( )
A.
have no effect on its terms of trade.
B.
harm its terms of trade.
C.
harm world terms of trade.
D.
improve its terms of trade.
【单选题】If Slovenia were a large country in world trade, then if it instituted a large set of subsidies for its exports, this must
A.
harm its terms of trade.
B.
have no effect on its terms of trade.
C.
improve its terms of trade.
D.
decrease its marginal propensity to consume.
E.
harm world terms of trade.
【单选题】假设同一名称的产品有不同的型号和产地，则计算每种产品平均单价的SQL语句是( )。
A.
SELECT 产品名称，AVG(单价)FROM 产品 GROUP BY 单价
B.
SELECT 产品名称，AVG(单价)FROM 产品 ORDER BY 单价
C.
SELECT 产品名称，AVG(单价)FROM 产品 ORDER BY 产品名称
D.
SELECT 产品名称，AVG(单价)FROM 产品 GROUP BY 产品名称
【简答题】People were【L12】______on their fires at that time.
【单选题】关于铁剂治疗缺铁性贫血，以下哪项不正确
A.
二价铁盐较易吸收
B.
最好于两餐之间服药
C.
常用口服剂量为硫酸亚铁1～2mg/(kg.次)，每日2～3次
D.
铁剂应用至血红蛋白达正常水平后2个月左右再停药
E.
注射铁剂能用肌肉注射者应尽量不用静脉注射
【简答题】The water-pipes were also【L9】______;
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