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澄清chãng qÿng

When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as _____.

A:ahead direction B:astern direction C:right-handed D:left-handed

______ does it take to change the main engine from ahead to astern?

A:How many times B:How much water C:How long D:How length

When the vessel on the full speed ahead, if full astern immediately ____ the main engine start astern and fuel injection.

A:after the thrust power is zero B:after the torsion is zero C:surpass the critical point on the water turbo phase D:after the speed is zero

Setting a sealing equipment astern on the tailshaft can ’t ____.

A:prevent the seawater from intergrating B:prevent the lube oil from running out of the outside aboard C:strengthen the intencity of the sterntube D:prevent the mud and sand from entering the lube oil system

____ is power supplied by main switchboard directly not through sub-board.

A:Deck machinery B:Little power load C:Some important load D:stationary submersible pump

Sometimes a tropical storm moves so slowly that a vessel, if astern of it, can ____ it．

A:cross B:approach C:proceed near D:run into"