A、60%
B、75%
C、90%
D、50%
更多“More than（）of the population in the United States lived in city areas in 1988.”相关的问题
A、safe speed only specified B、not less than 120 feet per minute C、not more than 120 feet per minute D、not more than 90 feet per minute
A、A.More than six short blasts and one long blast on the whistle B、B.Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm C、C.Three short blasts of the whistle supplemented by the same signal on the general alarm D、D.More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm
A、the after one is more than forward one B、the forward one is more than after one C、the forward one is the same with after one D、it depends on the type of engine
A、flashes at regular intervals at a frequency of 120 flashes or more per minute B、is yellow in color C、is visible over an arc of the horizon of not less than 180°nor more than 225° D、All of the above
A、High pressure compressors are more efficient than low pressure compressors B、Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit C、Two stage compressors are generally more efficient than single stage compressors D、The volumetric efficiency is decreased in multistage compressors
A、the tanker is within 50 nautical miles from the nearest land B、the tanker is no more than 50 nautical miles from the nearest land C、the tanker is more than 50 nautical miles from the nearest land D、the tanker is not more than 50 nautical miles from the nearest land
A、is always less than 100% B、is always more than 100% C、is always equal to 90% D、is always less than 90%
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