Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）.

Tensile stress is a result of two forces acting in（）.

Let’s submit the case（） the cargo surveyor.

The burden of proving unseaworthiness is upon those who（）it.

Please arrange（）a surveyor to inspect the damaged bulkhead．

Chain slings are suitable for heavy slender articles，such as（）.

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

Hatch No.1 must be cleaned up to meet the（）of the cargo surveyors．

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

The anchors on the bow are known as（）.