单项选择题
A.wash with salt water
B.wash with sterile mineral oil
C.treat it like frostbite
D.treat it like any burn
单项选择题 If the effective bearing area has been reduced , remedial action should be taken（）
单项选择题 Main diesel engine control can be obtained by the bridge （）
单项选择题 The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）