单项选择题
A.mold to develop on commodities
B.malfunction of the refrigeration equipment
C.contamination of the insulation in the space
D.All of the above
单项选择题 If a cargo of kerosene were considered too lean to explode，then it must be（）.
单项选择题 Generally speaking，the heavier cargo will go into the（），distributing it evenly fore and aft，the lighter cargo will probably be placed in the（）.
单项选择题 Cargo that is suitable for carriage on Ro-Ro vessels includes（）.