Engine: Expired / General Subjects

1. A Watertight doors below the waterline may be of the vertical or horizontal sliding type or the swinging hinged type.
2. B Watertight doors below the waterline may be either of the vertical or horizontal sliding type.
3. C Watertight doors below the waterline may be either of the vertical sliding type or the swinging hinged type.
4. D Watertight doors below the waterline may be either of the horizontal sliding type or the swinging hinged type.

Tip: press A-D to answer