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【单选题】
( )适用于较长距离和较大物体的探测。A.
电容式接近觉传感器
B.
超声波传感器
C.
红外线接近觉传感器
D.
气压式接近觉传感器
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皮皮学刷刷变学霸
举一反三
【简答题】一般平均数（静态平均数）的种类。
【单选题】According to the writer, what advantage does e-mall correspondence have over the traditional letter?
A.
It is more convenient to send.
B.
It causes fewer misunderstandings.
C.
It can be written in a less conversational style.
D.
It does not have the same time-consuming conventions.
【单选题】What advantage does TV have over newspapers?
A.
It can give news quickly.
B.
It can show more.
C.
You don't have to read anything.
D.
It has a more objective viewpoint.
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