关于“成本与可变现净值孰低法”，说法正确的有（）。

The purpose of inert gas systems aboard tank vessels is to ______.

A.allow sufficient oxygen in the tank to sustain life

B.prevent outside air from entering the tank

C.provide increase in cargo discharge pressure

D.comply with double hull pollution prevention regulations

A cantilever beam AB of an isosceles trapezoidal cross section has a length L = 0.8 m , dimensions= 80 mm and= 90 mm , and height h =110 mm (see figure). The beam is made of brass weighing 85 kN/m 3 . (a) Determine the maximum tensile stressand maximum compressive stressdue to the beam’s own weight. (b) If the widthis doubled, what happens to the stresses？ (c) If the height h is doubled, what happens to the stresses？

If your vessel is equipped with a radiotelephone，what must also be aboard？

A.Certificate of Inspection

B.List of ship stations

C.Copy of ship to shore channels

D.Radio station license

What may NOT be used when securing heavy vehicles aboard Ro-Ro vessels ________．

A.Chain lever

B.Turnbuckle

C.Webbing

D.Chain

What will the man do next？

A．Complain to the customer service center.

B．Get aboard without a special meal.

C．Talk to the clerk's supervisor.

D．Leave the city for good.

What will the man do next？

A．Complain to the customer service center.

B．Get aboard without a special meal.

C．Talk to the clerk's supervisor.

D．Leave the city for good.

What is used when securing heavy vehicles aboard Ro-Ro vessels ________．

A.Buckle or ratchet tensioner

B.Webbing

C.Manila rope

D.None of these

A cantilever beam AB is loaded by a coupleat its free end (see fgure). The length of the beamis L=2.0 m , and the longitudinal normal strain at the top surface is=0.0010 . The distance from the top surface of the beam to the neutral surface is c =85 mm . (a) Calculate the radius of curvature, the curvature, and the vertical deflectionat the end of the beam. (b) If allowable strain=0.0008 , what is the maximum acceptable depth of the beam？ [Assume that the curvature is unchanged from part(a)]. (c) If allowable strain= 0.0008 , c = 85 mm , and L= 4 m , what is deflection？