单项选择题
A.being shrunk into B.to be shrunk into C.to be shrunk with D.shrinking into
The crankshaft deflection is at first to be （） before a...
单项选择题The crankshaft deflection is at first to be （） before and after repair.
A.disassembled B.renewed C.measured D.regulated
The crank-room cover should not be opened until at leas...
单项选择题The crank-room cover should not be opened until at least （） minutes after the engine stops.
A.one B.fifteen C.sixty D.ninety
A.10 B.15 C.20 D.30
