面状要素也称多边形要素，是指由线封闭的面积,构成地理类型或地理区域。()
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真实孔径侧视雷达的分辨率包括距离分辨率和方位分辨率两种。()
消防安全重点单位的防火巡査的频率为()一次。
A. 每天
B. 每隔一天
C. 每周
D. 每隔一周
Which of the conditions listed represents the greatest effect of excess frost accumulation
A. Keeps the refrigerated space cooler
B. Reduces the efficiency of the plant
C. Takes the load off the compressor
D. Has no affect on the system
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