B．efore entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.

A．Orsat apparatus

B．flame safety lamp

C．Halide torch

D．combustible gas indicator

[单选题]Before being used the fuel service tank should be drained of （）.A . soda solutionB . mechanical impuritiesC . ballastD . water and residual

[单选题]In fighting a fire in a fuel tank, the FIRST action you should attempt is to _____.A．secure all sources of fresh air to the tankB．begin transferring the fuel to other tanksC．top off the tank to force out all vaporsD．station someone at the fixed CO2 r

[名词解释] Fuel tank capacity油箱容积

[单选题]The carrier has，before and at the beginning of the voyage，to（）due diligence to make the ship seaworthy.A . payB . exportC . importD . exercise

[单选题]Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.A . open the bypass lineB . cut in the lube oil coolerC . pressurize the lube oil systemD . top off the expansion tank

[单选题]The engine has one or two group of fuel pumps, depending upon （）.A . the number of fuel valvesB . the number of cylindersC . the speed of engineD . the power of engine

[单选题]When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.A . filter to remove the fuel oilB . use the settler to remove the fuel oilC . remove the fuel oil by centrifugingD . drain and then renew the lube oil supply

[单选题]听第7段材料，回答8-9题。第8题：Where has Barbara been?A． MileB． FlorenceC． Rome

[单选题]The tourist is prevented from entering a country if he does not have ________ passport.[A] an operative[B] a valid[C] an efficient[D] an effective

[单选题]H．arrywas________byabeewhenhewascollectingthehoney.A．)stungB)stuckC)bittenD)scratched