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【单选题】
滑阀和滑阀套径向配合间隙应控制在( )mm范围内。A.
0.01-0.06
B.
0.06-0.1
C.
0.001-0.006
D.
0.006-0.01
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【单选题】A vessel aground at night is required to show two red lights in a vertical line as well as （）.
A.
not under command lights
B.
restricted in her ability to maneuver lights
C.
anchor lights
D.
sidelights and a sternlight
【简答题】A vertical line at any point on the earth’s suce is the line that follows the direction of gravity at that point.
【简答题】A horizontal plane at a point is the plane that is perpendicular to the vertical line at the point.There is only one horizontal plane through a given point.
【单选题】[7-41]The ___is the point at which a vertical line through the heeled ship’s center of buoyancy intersects with the vertical line throu
A.
metacenter
B.
center of buoyancy
C.
Center of gravity
D.
center of flotation
【单选题】A vessel is carrying three lights in a vertical line. The highest and lowest of these are red and the middle light is white. Which statement is always TRUE?
A.
During the day，she would display three balls in a vertical line
B.
If making way，she would show masthead lights at night
C.
If at anchor，she need not show anchor lights while displaying identifying lights
D.
Her fog signal would consist of a rapid ringing of a bell for five seconds every minute
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