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【多选题】
在cable modem系统中,CM的作用为A.
调制解调
B.
网关
C.
连接用户PC和HFC网络
D.
分配带宽
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】我国的邻国共有几个?
【单选题】When transferring solution with a pipet, the correct operation to release solution is
A.
The pipet is inserted into the receiving container and removed as soon as the solution flows out naturally
B.
The pipet is vertical and the pipet tip is against the inner wall of the receiving container. After the solution flows out naturally, stop at least 30s and then move away.
C.
The pipet is vertical and the pipet tip is against the inner wall of the receiving container. After the solution flows out naturally, stop at least 5s and then move away
D.
The pipet is vertical, the solution flows out naturally and then stops for 15s, then moves away
【简答题】摄影测量中常用的坐标系有哪些?各坐标系的坐标原点和坐标轴是如何选择的?
【简答题】输液(infusion solution)
【简答题】摄影测量中常用的坐标系统有哪些？