准时化技术思想原理是四个“合适”，即（）
A.合适的时间
B.合适的货物
C.合适的数量
D.合适的地点
E.合适的人
参考答案：A, B, C, D
3千克8克与3008克一样重．______．（判断对错）
Distress flares and smoke signals for small passenger vessels（）.
A.are not required aboard vessels on runs of less than 30 minutes duration
B.must be Coast Guard approved and stowed in a portable，watertight container
C.must be marked with an expiration date not more than 42 months from the date of manufacture
D.All of the above
