When deciding the composition of the engineering watch, which may include appropriately, many factors shall be taken into account（）.<br>A:satisfied engineers<br>B:qualified ratings<br>C:satisfied chief engineer<br>D:qualified chief engineer

When deciding the composition of the engineering watch, which may include appropriately, many factors shall be taken into account（）.
A:satisfied engineers
B:qualified ratings
C:satisfied chief engineer
D:qualified chief engineer

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