单项选择题
The crankshafts of medium speed engines are almost invariably solid （） from a single piece of steel.
A.forged B.cast C.made D.shrunk
单项选择题 The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuating （）.
单项选择题 The crankshaft of diesel engine is supported by （）.
单项选择题 The crankshaft is of the semi-built type, with the （） being shrunk into the forged or cast steel crank throws.
