Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.<br>A:the column<br>B:the jacket<br>C:cylinder cover<br>D:cylinder liner

Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.
A:the column
B:the jacket
C:cylinder cover
D:cylinder liner

出自：海船船员证

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