末位淘汰法则是指企业为满足竞争的需要，通过科学的评价手段，对员工进行合理排序，并在一

A.hammering and jarring

B.vibration and pounding

C.varying magnetic fields

D.stable or permanent magnetism of the ship

The main purpose of port State control is not to___________.

A.prevent an unsafe ship proceeding to sea

B.prevent a ship threatening the marine environment

C.fine the ships

D.confirm a safe sailing

Permanent magnetism is caused by ______.

A.operation of electrical equipment and generators on board ship

B.the earth's magnetic field affecting the ship's hard iron during construction

C.the horizontal component of the earth's magnetic field acting on the horizontal soft iron

D.the vertical component of the earth's magnetic field acting on the vertical soft iron

A.There is danger of heavy cargo sweat if outside air is introduced by ventilation

B.Danger of the ship sweat exists．Constant and vigorous ventilation is required

C.There is little danger of ship's sweat；slight possibility of cargo sweat

D.The possibility of any ship or cargo sweat is remote

A.Danger of heavy ship sweat exists；constant and vigorous ventilation is required

B.There is danger of heavy cargo sweat if outside air is introduced by ventilation

C.There is little danger of ship's sweat，slight possibility of cargo sweat；moderate ventilation is needed

D.The possibility of any sweat problem，either cargo or ship，is remote

磁共振成像的英文全称正确的是

A、magnetic resonance image

B、magnetic resorbent image

C、magnetic resonance imaging

D、magnetic resorbent imaging

E、magnestal resorbent imaging

A.Heeling magnet

B.Flinders bar

C.Fore-and-aft magnets

D.All of the above can be set on magnetic east or magnetic west headings