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问题 单项选择题

在现有的幻灯片中加入以前做好并已经存盘的幻灯片，执行的操作是( )。

A．插入→幻灯片
B．插入→图片→来自文件
C．插入→幻灯片(从大纲)
D．插入→幻灯片(从文件)

答案

参考答案：D

单项选择题

焊接低、中碳钢和低合金钢构件时，当其受力情况复杂时，宜选用（）。

A．与钢材强度相等的焊条

B．比钢材强度高一级的焊条

C．比钢材强度低一级的焊条

D．与钢材化学成分相同的焊条
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单项选择题

IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.

A. extending B. minimizing C. demolishing D. reducing
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