Grace is a self-employed artist. She can make 20 pieces of pottery per week. She is considering hiring her sister Kate to work for her. Both she and Kate can make 35 pieces of pottery per week. What is Kate’s marginal product？

A . double sized mattress consists of more than 890 coils B . spar extending from a mast or a king post C . flap（Becker rudder）can be fitted to the rudder’s trailing edge D . bridle arrangement having a long beam of the length of the container

A . deeply-grooved drum on the windlass with sprockets which engage the links of the anchor chain B . winch that is running out of control due to a failure of the overspeed trips C . line that has jumped off the gypsyhead while under strain D . nylon line that parts under strain and whips back in a hazardous manner

A . block used only with manila rope B . chock roller C . hinged block D . strong block used for short，sharp pull

A . mooring line made of spring lay wire rope B . mooring line running diagonally to the keel C . mooring line parallel to the keel D . wire rope used for securing an anchor buoy

A . deck fitting used to secure mooring lines B . casting fitted at the side of a weather deck，used as a fairlead C . sharp block of wood used to support hygroscopic cargo D . smoke pipe for the galley stove

A . cross connection line between two main fire lines B . special wrench for the couplings in a fire hose line C . tackle rigged to support a fire hose D . none of the above

A . conductivity higher than a normal conductor B . conductivity higher than a normal insulator C . high conductivity at low temperatures D . low conductivity at high temperature

A . tree or long awash in a nearly vertical position B . crew member who refuses to work C . upstream end of a load wall D . buoy that is adrift

A . grooved wheel in a block B . line to hold a lifeboat next to the embarkation deck C . partial load of grain D . seaman's knife

A . mallet used when splicing wire rope B . sharp pointed crow bar used to unlay wire rope C . tapered steel pin used to separate wire rope D . tapered wooden pin used when splicing heavy rope

A . Hang on a moment, please B . No, you can’t. C . Surely you can. D . With pleasure

A . You are within 3 nautical miles of the coast B . The bottom in the area is sand and gravel C . The fix is indeterminate D . You are governed by the Inland Rule

A . pragmatic B . grammatical C . mental D . conceptual

A.positive B.negative C.indifferent D.objective

A．Which B．That C．What D．Where

A．pidgin B．creole C．dialect D．lingua franca

A．55 pieces of pottery B．35 pieces of pottery C．22．5 pieces of pottery D．15 pieces of pottery

A．The curator of the museum B．An expert on the history of fashion C．A photography teacher D．A visitor of the museum

是 否