单项选择题

（） are mounted on and bolted to the bed-plate cross girders.

A.The crankshaft
B.The crankcase
C.The guide-ways
D.The frames

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单项选择题
（） are formed by abrasive particles entering the bearing and scoring the shaft.

A.Grooves
B.Recesses
C.Ridges
D.Nips
单项选择题
（） are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.

A.Diffusers
B.Compressors
C.Steam boilers
D.Soot blowers
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