A negative metacentric height （）. should always be immediately corrected。 will always cause a vessel to capsize。 always results from off-center weights。 All of the above are correct。
简述炎症的定义。
The position of the piston parts in relation to each other is secured by means of （） and a dowel pin in the crown. bosses。 through bolts。 machine-turned recesses。 long stud。
The position of the piston parts in relation to each other is secured by means of （） in the crown. a mark。 a bolt。 a dowel pin。 a measuring tool。
A natural fiber rope can be ruined by dampness because it may （）. rot。 shrink。 stretch。 unlay。
A navigator fixing a vessel’s position by radar （）.
