单项选择题
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
A.means of rheostat the governor settings B.a balance coil excitation C.adjusting the governor settings D.changing excitation
单项选择题 The treatment of the fuel oils involves storage, heating, filtering and（）
单项选择题 Which of the following items don’t belong to dock repair works?（）
单项选择题 During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
