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單項(xiàng)選擇題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.

A.advantages
B.disadvantages
C.power advantages
D.power disadvantages

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1.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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2.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

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3.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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4.單項(xiàng)選擇題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.

A.through bolts
B.jack bolts
C.tap bolts
D.fitted bolts

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5.單項(xiàng)選擇題To prevent excessive （） in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible.

A.thermal stresses
B.bending moments
C.thermal loads
D.surface tensions

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