设关系R(SNO，SNAME，DNO，MAG)，主键为SNO。其中SNO为学生号，S

加用短时作用的血管扩张药使血压适度降低，以减少出血属（）

A．诱导麻醉

B．神经安定镇痛术

C．麻醉前给药

D．控制性降压

E．基础麻醉

C

If you are a fruit grower—or would like to become one—take advantage of Apple Day to see what’s around. It’s called Apple Day but in practice it’s more like Apple Month. The day itself is on October 21, but since it has caught on, events now spread out over most of October around Britain.

Visiting an apple event is a good chance to see, and often taste, a wide variety of apples. To people who are used to the limited choice of apples such as Golden Delicious and Royal Gala in supermarkets, it can be quite an eye opener to see the range of classical apples still in existence, such as Decio which was grown by the Romans. Although it doesn’t taste of anything special, it’s still worth a try, as is the knobbly(多疙瘩的) Cat’s Head which is more of a curiosity than anything else.

There are also varieties developed to suit specific local conditions. One of the very best varieties for eating quality is Orleans Reinette, but you’ll need a warm, sheltered place with perfect soil to grow it, so it’s a pipe dream for most apple lovers who fall for it.

At the events, you can meet expert growers and discuss which ones will best suit your conditions, and because these are family affairs, children are well catered for with apple-themed fun and games.

Apple Days are being held at all sorts of places with an interest in fruit, including stately gardens and commercial orchards(果园).If you want to have a real orchard experience, try visiting the National Fruit Collection at Brogdale, near Faversham in Kent.

What can people do at the apple events?（）

A. Attend experts’ lectures.

B. Visit fruit-loving families.

C. Plant fruit trees in an orchard.

D. Taste many kinds of apples.

下列有关部件的安装要求正确的是（）。

A.排烟口距可燃物或可燃构件的距离不应小于1.5m

B.常闭送风口、排烟阀（口）的手动驱动装置应固定安装在明显可见、距楼地面1.3～1.5m之间便于操作的位置

C.活动挡烟垂壁与建筑结构（柱或墙）面的缝隙不应大于60mm

D.由两块或两块以上的挡烟垂帘组成的连续性挡烟垂壁，各块之间不应有缝隙，搭接宽度不应小于150mm

E.活动挡烟垂壁的手动操作按钮应固定安装在便于操作、明显可见处距楼地面1.0～1.5m之间

数据库系统运行过程中，由于应用程序错误所产生的故障通常称为

A．设备故障

B．事务故障

C．系统故障

D．介质故障

下列属于可能引发髙处作业风险的是（）。

A.高处作业人员不熟悉作业环境

B.未佩戴防坠落防滑用品

C.作业人员患有恐高症、高血压等职业禁忌症

D.基坑开挖作业未按照规定配备通信联络工具

E.未召开安全工作会议