单项选择题 To increase the distance to the vessel ahead by reducing one’s own speed means（）.

单项选择题 To run a vessel upon a beach to prevent its sinking in deep water means（）.

单项选择题 To secure a vessel in a particular place by means of chains or ropes made frast to the shore, to anchors, or to anchored mooring buoys, or to ride with both anchors down defines（）.