They found the conditions there ________.

[单选题]（） neutralizes the acid conditions and（） cleanses the rings and grooves.A . The detergency；the alkalinityB . The alkalinity；the detergencyC . The inhabitant；the waterD . The additives；the distilled water

[单选题]Which of the following conditions will make a relation that is in first normal form. to be in second normal form?Ⅰ.every non-key attribute is functionally dependent on the full set of primary key attributes.Ⅱ.no non-key attributes exist in the relati

[单选题]Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?A．Ignition lag increases.B．Lube oil system pressure increases.C．Brake specific fuel consumption increases.D．Mechanical efficiency in

[单选题]Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?A．The mixture is too lean to burnB．The mixture is too rich to burnC．The vapor is about to explodeD．Conditions are perfect for

[单选题]Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?A．Leaking seal ringB．Insufficient heat transfer from the exhaust valvesC．Blocked cooling water passages to the headD．Excessive scavenging air provided

[单选题]Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?( )A．Shortage of refrigerant oilB．Slight shortage of refrigerantC．Excessive condenser c

[单选题]Operating conditions in the crank chamber are very （） those in the cylinder.A . the same asB . similar toC . separated fromD . different from

[单选题]Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）A . Increased suction head pressureB . Decreased feedwater temperatureC . Pump recirculating line being open too muchD . Excessive feedwater tempera

[单选题]Which of the listed conditions can be considered as the single greatest cause of accidents?A．SpeedB．Excessive knowledge or skillC．Human errorD．Excitement

[单选题]If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two stroke/cycle diesel engine will develop approximatelyA．the same indicated horsepower as a four-stroke/cycle engineB．twice the indicated horsepower as a