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单项选择题
系统抗干扰性能是单片机系统可靠性的重要指标( )。
A．对
B．错
B．错
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问答题
Listen to this passage again and try to fill the blanks of the following summary.
This passage mainly talks about [填空1]________ of umbrella in different periods of time, as well as [填空2]______________ in each time. For example, it was used as a [填空3]_________ in ancient Egypt and Babylon, and it was considered a symbol of [填空4]______ in the late 16th century. The first people in Europe to use the umbrella as protection against rain were [填空5]___________. [填空6]_________ didn’t begin to be made until the 20th century.
答案：
第1空:the development history 第2空:the different uses 第3空:sun...
