英语作文:写给kate的一封信,告诉她我的运动安排,饮食习惯,睡眠情况

英语作文:写给kate的一封信,告诉她我的运动安排,饮食习惯,睡眠情况

radar to emit light pulses or radio waves to determine when an event occurs.. Part of the pulse is reflected back from the incident, and the observer can measure the time when he receives the echo. The event's time can be considered as the midpoint of the two moments when the pulse and the pulse reflect back from the received; the distance of the event is desirable for the time of the round-trip half of the time by the speed of light. (in this sense, an event occ

我。。知。。道 加。。我。。私。。聊

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