The angle at which the anchor flukes penetrate the soil is the（）.

Periodic surveys to renew the load line assignment for a ship must be made at intervals not exceeding（）.

The lines led forward from the bow and aft from the stern when a vessel is moored to the dock are（）.

In the ship construction portfolio，materials which do not conform to ASTM or ABS specifications must also include the（）.

Sometimes it is desirable to connect a member both by riveting and welding. Which statement is TRUE concerning this procedure? （）

The end of the joint with the exterior threads is called the（）.

Should the vessel have no deratisation certificate at the time of her delivery，she（）be held to be unseaworthy.

Before welding in a tank that has carried petroleum products，the tank must be certified by （）.

Connecting elements of a mooring system should be fabricated from（）.

At the same time，it is（）for you to signify your acknowledgement of the responsibility for the collision by signing the copies of this letter hereto attached and to return me two copies in due time.