皮皮学，免费搜题
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【单选题】
对HC-SR04超声波测距模块描述错误的是？A.
模块自动发送10个 40kHz的，自动检测是否有信号返回
B.
其具有50cm-400cm的非接触式距离感测功能
C.
模块包括超声波发射器、接收器与控制电路
D.
共 4路信号:VCC，GND，TRIG，ECHO
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】书籍设计是设计师对书的内容准确地领悟和理解后,经过周密的构思、精心的策划和 () 的运筹的完整过程。
【单选题】A: I heard you've had your book published. Congratulations! B: ______
A.
Don't mention it. It's nothing.
B.
It's very kind of you to do so.
C.
Thank you for the information.
D.
Thank you. I was thinking of giving you a copy.
【单选题】You’d never heard of it before I told you,________?
A.
did you
B.
didn’t you
C.
would you
D.
had you
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