In terms of vessel manning，a watch is the（）. direct performance of deck or engine operations in a scheduled and fixed rotation。 performance of maintenance work necessary for the vessel's safe operation，on a daily basis。 performance of lookout duties。 direct performance of cargo loading and discharge operations only。
某些蝶类的翅上生有许多小眼斑，其功能是：（） 警戒色。 吸引小鸟。 保护色。 拟态。
“火灾控制计划”是由防火安全小组制定的。
一个可食物种模拟一个不可食物种称为：（） 贝次拟态。 缪勒拟态。 警戒色。 拟态集团。
Even in the absence of express instructions，the authority of the master of a ship is very large and（）to all acts that are usual and necessary for the employment of the ship. expends。 spreads。 extends。 enlarge。
A warp end may be fitted for operating the derrick topping wire which adjusts the derrick （）.
