单项选择题
A.in any emergency or if in any doubt as to what decision or measures to take
B.in the event of any impending action in machinery spaces that may cause reduction in ship’s speed
C.when isolating and bypassing machinery to be worked on
D.co-operating with any engineer in charge of maintenance work
单项选择题 When the machinery spaces are in the periodic unmanned condition, shall be immediately available and on call to attend the machinery space（）.
单项选择题 All member of the engineering watch shall be familiar with assigned watch-keeping dutiesIn addition, every member shall, with respect to the ship they are serving in have knowledge of（） Ⅰ.the use of appropriate internal communication systems Ⅱ.the use of GMDSS Ⅲ.the escape routes from machinery space Ⅳ.the number location and types of fire-fighting equipment in the machinery spaces
单项选择题 When deciding the composition of the engineering watch, which may include appropriately qualified ratings, following criteria shall be taken into account（） Ⅰ.the type of ship Ⅱ.the type and condition of the machinery Ⅲ.the safety of life, ship, cargo and port Ⅳ.the observance of international, national and local regulations