All of the followings are the detainable deficiencies under the SOLAS Convention expert（）.
A. Failure of proper operation of propulsion and other essential machinery, as well as electrical installation
B. Failure of the proper operation of the main and auxiliary steering gear
C. Failure of engineering watch arrangements to confirm to the requirements specified for the ship by Administration
D. Failure of the proper operation of emergency generator, lighting, batteries and switche
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