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问题 单项选择题

AP平台火灾探测系统介质释放模块有3个状态显示LED，红色以（）闪动表示故障状态

A、4HZ频率（50%亮，50%灭）

B、1HZ频率（5%亮，95%灭）

C、1HZ频率（95%亮，5%灭）

D、5HZ频率（50%亮，50%灭）

答案

参考答案：A

改错题

下列文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改仅限一词；

2. 只允许修改10处，多者（从第11处起）不计分。

When Jack bowed to someone，he always did much too quickly. You needn’t wait any longer after he finished nod his head. So he was blamed for no manner. One day a warm­hearted man has taught him，“When you bow to somebody next time，you can count January，February，March，until December. Then you could lift your body up. Thus the ceremony will be very perfect.”

The next day，he met his uncle. He did as the men told .The bow was too long that it made his uncle escape away soon with a surprising look. When Jack looked down，he found his uncle gone. So he asked the passers-by，“In what month did he go away？
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单项选择题

按住下列是哪个键可保证椭圆选框工具绘出的是正圆形（）。

A.Shift

B.Alt

C.Ctrl

D.Alt+Shift
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