题目内容：
Before leaving the classroom, please turn off the lights.
参考答案：
答案解析：
选择题：Before leaving the classroom, please turn off the lights.
- 题目分类： 大学英语B级
- 题目类型：选择题
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单稳态电路用于消除噪声时，单稳态电路的输出脉冲宽度应（）噪声宽度。A．大于B．小于C．等于D．近似于
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I am glad to hear the good news.
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I can't finish the task within 1 hour.
I can't finish the task within 1 hour.