不能修改当前数据表记录内容的命令有()。A.UPDATE B.REPLACE C.D

题型:单项选择题

问题:

不能修改当前数据表记录内容的命令有()。

A.UPDATE

B.REPLACE

C.DISPLAY

D.BROWSE

考点:计算机科学技术VFP数据库VFP数据库题库
题型:单项选择题

TXB2减少见于()

A.血栓前状态

B.糖尿病

C.心肌梗死

D.脑血栓形成

E.服用阿司匹林类药物

题型:单项选择题

(16分)在直角坐标系xOy中,第一象限内存在沿y轴负方向的有界电场,其中的两条边界分别与Ox、Oy重合。在第二象限内有垂直纸面向外的有界磁场(图中未画出),磁场边界为矩形,其中的一个边界与y轴重合,磁感应强度的大小为B。一质量为m,电量为q的正离子,从电场中P点以某初速度沿-x方向开始运动,经过坐标(0,L)的Q点时,速度大小为,方向与-y方向成30°,经磁场偏转后能够返回电场,离子重力不计。求:

(1)正离子在P点的初速度;

(2)矩形磁场在x方向的最小宽度;

(3)离子在磁场中运动的最长时间。

题型:单项选择题

阅读理解。

     Garden Route, South Africa

    Take in this fresh sea air in this beautiful coastal setting as you cruise the famous Garden Route in the

Western Cape in South Africa. A wild life break is a must, as is enjoying great meal stops along the route. There are wild life reserves throughout the Garden Route National Park you can swing into and spend a

sleepy morning in a car looking for giraffes and lions. And just over your shoulder in the big blue there are whales to be watched (if the season is right).

     Top tip: Add a trip to the Eastern Cape to your Garden Route trip. It is much less known than the

Western Cape and full of landscapes. The gas station is occasionally seen.

     Great Ocean Road, Australia

     Sweep along this dramatic coastal road in Australia with views of the Sourthern Ocean from Geelong

to Portland, in Victoria, and you won't regret it. Anyone who has driven it just can't stop talking about it,

and with good reason. There're loads to see and plenty of great stops. There's whale-watching here too,

and other natural life. And to top it all, there'll be plenty of good old Aussie kindness and welcome when

you pull in for lunch or a coffee stop.

     Top tip: Rent an open-top car so you can really drink in that sea air.

     Stelvio Pass, Italy

     If you like snake-like paths and mountain passes, you'll love this. Stelvio in Italy. The mountain slopes

stretch away on either side of the road, with snow-topped peaks within sight. There's a great view down

the pass. And from the top, it's just a short sweep away from the Swiss border, so if you are gripped by

mountain road driving, you can drive from here down to Swiss ski resort Davos. Stelvio has 48 hairpins

(急弯) on the north side and 12 on the decent (陡坡) to Bormio, so this route is not recommended for

new drivers, or those with a fear of heights. This decent is is often featured in the Giro d'Italia, the Italian

version of the Tour de France, so you may have glimpsed it on the television.

     Top tip: Take some Swiss Francs as well as some Euros, so you can make the trip a cross-border

experience.

1. In which travel routes can one enjoy whale-watching?

A. Stelvio Pass, Italy and Garden Route, South Africa

B. Great Ocean Road, Australia and Stelvio Pass, Italy

C. Garden Route, South Africa and no other route

D. Great Ocean Road, Australia and Garden Route, South Africa

2. The tips in the ad are meant to ________.

A. introduce a new route to the drivers

B. help drivers find gas stations on the route

C. give useful advice to make the trip more pleasant

D. warn drivers of the possible dangers on the road

3. Compared with the other two routes, Stelvio Pass is special in that ________.

A. it's more winding and challenging

B. it's safe and more suitable for new drivers

C. it has lots of wild animals on either side of the road

D. it's often featured in Tour de France and thus more famous

4. What's the best title for the travel advertisement?

A. Drive to South Africa, Man!            

B. Drive Travel for Whale Watching!

C. A Travel to Three Continent!          

D. Exciting Drive Travel in the Wild!

题型:单项选择题

特种设备作业人员违反特种设备的操作规程和有关的安全规章制度操作,或者在作业过程中发现事故隐患或者其他不安全因素未立即向现场管理人员和单位有关负责人报告,特种设备生产、使用单位未给予批评教育或者处分的,责令特种设备生产、使用单位改正,并处1万元以上5万元以下罚款。

题型:单项选择题

低摩合成闸瓦的摩擦系数较小,可与()通用。

A.普通铸铁闸瓦

B.中磷铸铁闸瓦

C.高磷铸铁闸瓦

D.任何闸瓦

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