一维数组的逻辑结构是（），存储结构是（）；对于二维或多维数组，分为（）和（）两种不同的存储方式。
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亮度的单位是（）。
A. Lx
B. cd
C. Lm
D. cd/m2
In launching a lifeboat，when should the tricing pendants be released?（）.
A. Before the boat is lowered from the stowage position
B. As soon as the boat-fall blocks clear the davit head
C. After the limit switch is activated
D. After all people have been embarked
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