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Directions : Read the following text. Choose the best word or phrase for each numbered blank and mark A, B,C, or D on, ANSWER SHEET1. A webcam is a digital camera that sends video images to other computer users. It's about the(26) 0f a pool ball and typically (27) 0n top of your computer monitor. Once the webcam is(28) to the USB port of your computer with the necessary software, (29) images of you can be sent to one or more users over the Internet (30)an instant messaging(IM) service. A webcam costs about $50. More expensive models come with added (31) , such as better picture resolution. Two leading makers, Logitech and Creative, offer a range of models, (32) software is included. There is no extra Internet (33) to send or receive video images, though you'll have t0 (34) for a free instant messaging service. Everyone can see and hear one another in (35) time. Grandparents can see their grandkids more (36)' Webcams can work with al-most any computer bought in the past five years and can (37) long distance phone bills.(38) you have broadband, that is, a high-speed cable-modem or DSL connection, images may (39) a long time to download, (40) a slide show rather than a movie. While webcams are easy to link to your computer, learning to (41)the software can take time. You have to make some rearrangement with the configurations. (42) you have a 56k modem and the people you want t0 (43) won't mind seeing live shots instead of perfect video, a webcam is still fun. (44) before you buy, be sure everyone (45) for the same IM service. 26. [A] weight [B] size [C] volume [D] space
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【简答题】student.xml 对给定的student.xml,按要求完成下列XPath查询操作: (1)查找所有’女’学生的ID,给出XPath表达式与结果截图 (2)查找具有Java 技能或C#技能的学生的姓名,给出XPath表达式与结果截图 (3)查找出具有四项技能的学生姓名,给出XPath表达式与结果截图 (4)查找所有学生的第一技能,要求写出两个不同的XPath表达式,并执行相应的查询计划,比较...
【简答题】(1)实指数信号的特性是:( ) (2)描述正弦信号的三大要素是:( ) (3)Sa(t)函数图形的两大特点是:( ) (4)四个奇异信号(单位斜变信号、单位阶跃信号、单位冲激信号及冲激偶信号)之间的关系是:( ...
【判断题】单位冲激信号的幅度是 1 。
A.
正确
B.
错误
【单选题】转座机制的 3 种类型,下列哪种是错误的:
A.
复制型
B.
保守型
C.
非保守型
D.
非复制型
【单选题】( )指脱去部分水分的全脂牛奶。通常脱去50%的水分,配以白糖制成。
A.
牛奶
B.
奶油
C.
奶粉
D.
炼乳
【单选题】关于三阶行列式说法正确的是( )
A.
若行列式的所有元素都等于零,则行列式的结果一定等于零
B.
若行列式的所有元素都等于零,则行列式的结果一定不等于零
C.
若行列式的所有元素都不等于零,则行列式的结果一定等于零
D.
若行列式的所有元素都不等于零,则行列式的结果一定不等于零
【多选题】业务流程是一系列连续有规律的活动以确定的方式执行,导致特定结果的实现,其特性为( )。
A.
协同性
B.
整体性
C.
事务性
D.
目标性
【判断题】SCCP为事务处理应用部分
A.
正确
B.
错误
【判断题】单位冲激信号的幅度是 1 。
A.
正确
B.
错误
【简答题】请简述浸渍法的操作过程。
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