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

单项选择题 The crankshafts on the large modern 2-stroke crosshead engines are （）big （）makes as a single unit and so are constructed by joining together individual forgings.

单项选择题 Because the tie bolts are so close to the crankshaft, some engines employ （）to hold the crankshaft main bearing cap in position instead of conventional studs and nuts.