Mean low water is the average height of（）.<br>A:the surface of the sea<br>B:high waters and low waters<br>C:all low waters<br>D:the lower of the two daily low tides

Mean low water is the average height of（）.
A:the surface of the sea
B:high waters and low waters
C:all low waters
D:the lower of the two daily low tides

出自：海船船员证

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