Hygroscopic cargoes should be ventilated when（）.
A. going from a warm to a cold climate
B. the dew point of the outside air is greater than the dew point of the air in the hold
C. the dew point of the air in the hold is very low
D. the outside dew point is 16°C and the cargo temperature is 12°C
航行中航海日志应记载的事项有：（）I、每班巡回检查的II、发生海事的情况，自救或救助它船的经过、措施及效果；III、自动舵与手操舵转换的时间；IV、货舱的检查和保管货物的措施
A. I~IV
B. I~III
C. II~IV
D. IIV
直线中线测量每百米误差不超过（）。
A. 1mm
B. 2mm
C. 3mm
D. 4mm
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