计算机病毒是人为编制的程序,它具有()。A.传染性 B.毁灭性 C.滞后性 D.以上

题型:单项选择题

问题:

计算机病毒是人为编制的程序,它具有()。

A.传染性

B.毁灭性

C.滞后性

D.以上都不是

考点:电子商务师助理电子商务师2009年全国助理电子商务师考试真题试卷二
题型:单项选择题

阅读短文,选择正确选项。

      Jim, Kate and Mingming are doing their homework together. Jim's spelling of "Monday" is wrong. Kate tells

him about it. Mingming doesn't have an eraser. She wants to borrow one from Jim or Kate. Jim gives it to

Mingming. The three children are students in Class 3, Grade 1 of No. 11 Middle School in Beijing. Jim is from

the UK. Kate is from the USA. Mingming is a Chinese girl. The three students are good friends. They often do

homework together and play together. They often help each other.

1. Jim is _______. [ ]

A. an English girl

B. an American girl

C. an English boy

D. an American boy

2. Kate helps Jim with _______. [ ]

A. his spelling

B. an eraser

C. a ruler

D. a coloured pencil

3. Mingming borrows _______. [ ]

A. an eraser from Kate

B. an eraser from Jim

C. a ruler from Kate

D. a ruler from Jim

4. The three students are _______. [ ]

A. not in the same grade

B. in the same class

C. in the UK

D. at the shop

5. The three students are _______. [ ]

A. doing some reading

B. playing games

C. doing their homework

D. cleaning the room

题型:单项选择题

胃溃疡疼痛的特点是()

A.进食后1小时内疼痛

B.进食后3~4小时疼痛

C.进餐前2小时疼痛

D.进餐后2小时疼痛

E.疼痛无固定时间

题型:单项选择题

如图所示,有界匀强磁场的磁感应强度B=2×10-3T;磁场右边是宽度L=0.2m、场强E=40V/m、方向向左的匀强电场.一带电粒子电荷量q=-3.2×10-19C,质量m=6.4×10-27kg,以v=4×104m/s的速度沿OO’垂直射入磁场,在磁场中偏转后进入右侧的电场,最后从电场右边界射出.求:

(1)大致画出带电粒子的运动轨迹;(画在答题纸上给出的图中)

(2)带电粒子在磁场中运动的轨道半径;

(3)带电粒子飞出电场时的动能EK

题型:单项选择题

急性肾功能衰竭少尿或无尿期,需紧急处理的电解质紊乱为()。

A.低氯血症

B.低钠血症

C.低钙血症

D.高钾血症

E.高镁血症

题型:单项选择题

患者,女,25岁。无不适症状,体检发现心律失常,心脏X线及超声心动图均正常,心电图为室性期前收缩。

宜首选的治疗方式为

A.长期服苷罗帕酮

B.卧床休息及血管扩张药

C.随诊观察,不需抗心律失常药

D.服糖皮质激素

E.限制体力活动

更多题库