2. 外语
  3. A new computer system has been designed to stop ships sinking. The greatest danger 【21】______ a holed vessel is that flooding

A new computer system has been designed to stop ships sinking. The greatest danger 【21】______ a holed vessel is that flooding

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问题 A new computer system has been designed to stop ships sinking. The greatest danger  【21】______   a holed vessel is that flooding of its compartments will make the ship unstable enough to capsize. It is estimated that nearly half the ships  【22】______   during the second world war capsized because of the loss of  【23】______   .
     Pacer systems of Burlington, Massachusetts, has now  【24】______   a system devised by a  【25】______   US Navy officer, Stephen Drabouski, which effectively thought out alternative strategies for the ship. The  【26】______   is programmed with every possible eventuality of flood damage.  【27】______   the actual damage is keyed into the computer the operator is told by the computer   【28】______   the implications are and what can be done to destabilize the vessel.
     Trials on the "American aircraft carrier USS Midway" have  【29】______   that the reaction time to damage can be cut to a fiftieth. An incident was simulated in which the ship was  【30】______   by two missiles causing flooding to 30 compartments. It took 10 minutes  【31】______   receipt of the flood damage information in the damage control center to a full printout of damage effects,  【32】______   countermeasures and an assessment of the result of the countermeasures;
   In a re-run of the incident   【33】______   the computer program the damage control officer took four and a quarter hours to establish the 【34】______   of the damage and another four hours  【35】______   a decision could be taken on counter measures.
     【36】______   the system can be used to provide damage control officers with advice, they do not, of course, have to  【37】______   the information. Quite often the"  【38】______  solution" will be unacceptable for operational reasons. When that happens the system can be asked for  【39】______   or the operator can interrogate the computer to find out what would happen  【40】______   the officer’s own solution was put into action.  
【40】
选项 A、after
B、when
C、before
D、if
答案D
解析
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