【单选题】The pistons are cooled by oil supplied from the forced () system.
【单选题】Oil is supplied to moving parts of the engine by ___ or slashing.
【判断题】宇称算符 的本征函数中属于本征值 1的 具有奇宇称,属于本征值 -1的 具有偶宇称
【单选题】The operating water is supplied under the ______of an oil separator.