9. Which of the followings is a timekeeper?
(A) RADAR.
(B) Chronometer.
(C) Anemometer.
(D) Clinometer.

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統計: A(11), B(43), C(11), D(10), E(0) #3414882

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1. 題目解析 題目問的是哪一項是「計時...
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