问题：
[单选] The crankcase can not be opened （）the parts have been cooled down.
if。as。unless。whe。
问题：
[单选] The crankcase cover should never be allowed to open for investigation when （）
the engine stops。the engine is running。you repair the engine。overhauling the engine。
问题：
[单选] The crank-room cover should not be opened until at least （） minutes after the engine stops.
10。15。20。30。
问题：
[单选] The crank-room cover should not be opened until at least （） minutes after the engine stops.
one。fifteen。sixty。ninety。
问题：
[单选] The crankshaft deflection is at first to be （） before and after repair.
disassembled。renewed。measured。regulated。
问题：
[单选] The crankshaft is of the semi built type, with the journal （） the forged or cast steel crank throws.
being shrunk into。to be shrunk into。to be shrunk with。shrinking into。
问题：
[单选] The crankshaft is of the semi built type, with the journal （） the forged or cast steel crank throws.
shrunk into。expanded into。extended into。designated into。
问题：
[单选] The crankshaft of diesel engine is supported by （）.
tension stretch。tie rods。through bolts。main bearing。
问题：
[单选] The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuating （）.
bending stresses弯曲应力。torsion stresses扭转应力。shear stresses剪应力。All of the above。
问题：
[单选] The cross-head shoes are white metal （）.
lining。lined。made。i。
