在Linux中，如果当前目录是/home/sea/china，则下面哪一个目录是china目录的父目录。（）

A:/home/sea B:/home/ C:/ D:/sea

船名为“SEA”。( )

In a central cooling system, used in some modem ships, sea water is supplied to cool _____ which will circulate to other individual cooler, greatly reducing the corrosion problems.

A:main bearings B:sea water C:cooling oil D:lower temperature fresh water

In an oil cooler circulated by sea water, the oil is at a larger pressure, the result being that any leak in the cooler will mean a loss of _____.

A:oil B:sea water C:refrigerant D:fresh water

According to the international regulations concerning the prevention of pollution of sea areas from ships, the disposal into the sea of all plastics is _____.

A:welcome B:admitted in some special sea areas C:prohibited D:acceptable

The____ is a series of trials done at sea to determine whether the ship has met the specifications of design, modification, or repair.

A:Sea trial B:Bed-test C:Engine performance D:PSC inspection

"The discharge into sea of ______ is prohibited．

A:ballast water B:tank washings C:residues or mixtures D:substances in category A"

"The sea painter is ______．

A:a hoisting eye B:a pair of soft paddings C:a hook D:a line"

A sea anchor is ______．

A:a heavy anchor with an extra long line used to anchor in deep water B:a cone shaped bag used to slow down the wind drift effect C:a pad eye to which the sea painter is made fast D:made of wood if it is of an approved type"