在两个螺栓的螺纹上涂抹少量滑油
AApply a small quantity of oil to the threads of the two bolts.
BLubricate the threads with a small quantity of oil.
CLubricate the two bolts with oil.
AApply a small quantity of oil to the threads of the two bolts.
BLubricate the threads with a small quantity of oil.
CLubricate the two bolts with oil.