用红光（R）和远红光（FR）交替照射处理莴苣种子，观察对种子萌发率的影响，结果见下表。从以下实验数据可以得出：（）
A. 红光促进莴苣种子萌发
B. 莴苣种子萌发需红光和远红光交替照射
C. 远红光促进莴苣种子的萌发
D. 红光的促进作用可以被随后照射的远红光降低
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Intheeventofasmallbunkeroilspillondeckoccurringwhilebunkering,youshould（）.
A. washdowntheareaimmediatelywithafirehose
B. washdowntheareawithkerosene
C. covertheareawithabsorbentmaterial
D. covertheareawithfoam
Smalloilspillsondeckcanbepreventedfromcontaminatinganywatersby（）.
A. pluggingallscuppersanddrains
B. placingfloatingboomsaroundtheship
C. regularlyemptyingalldrippans
D. thoroughlydrainingallbunkeringhoses
Aclass"C"firewouldmostlikelyoccurinthe（）.
A. engineroombilges
B. mainswitchboard
C. paintlocker
D. ragbin
Aclass"C"fireisburning（）.
A. dieseloil
B. magnesium
C. dunnage
D. electricalinsulation
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