单项选择题 The （） of the semi-built method of the construction crankshaft is that by making the two webs and crankpin from a single forging the grain flow in the steel follows the web round into the crankpin and back down the other web.

单项选择题 Today, crankshafts for large 2-stroke crosshead engines are of the （）type.

单项选择题 The crankpins and journals were machined and matching holes bored in the webs, which were slightly （） in diameter.