An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
A. oil foaming in the compressor
B. higher than normal suction and discharge pressures with a higher box temperature
C. higher than normal discharge pressure with a normal box temperature
D. the compressor to run continuously
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在2005年4月正式批复的广州市最新的行政区划调整方案中,新设立了萝岗区和()。
A. 番禺区
B. 天河区
C. 花都区
D. 南沙区
中转列车作业时可以不插设分车牌。
A. 正确
B. 错误