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單項(xiàng)選擇題

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

A.semi-built
B.built-up
C.solid forged
D.individual forged

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單項(xiàng)選擇題

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

A.smaller
B.larger
C.higher
D.lower

單項(xiàng)選擇題

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.

A.enough；to
B.too；to
C.such；so
D.so；that

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