单项选择题
A.connecting rods B.piston rods C.tie rods D.jack-bolts
Administrations should bear in mind the significance of...
单项选择题Administrations should bear in mind the significance of （） in maintaining safety of life and property at sea and in preventing marine pollution.
A.advanced nautical equipment B.advanced performance main engines C.emergency equipment D.communication and language skills
Adjust （） by means of lead wire.A.the clearance of the ...
单项选择题Adjust （） by means of lead wire.
A.the clearance of the main bearing B.the diameter of main bearing C.the gap of main beating D.the tolerance of main bearing
Additives （） protective layers on metal surfaces guardi...
单项选择题Additives （） protective layers on metal surfaces guarding them against corrosion.
A.damage B.form C.dissolve D.contaminate
