One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.<br>A:casting interlocking components<br>B:welding plates to form sections for assembly<br>C:forging integral components<br>D:case hardening integral components

One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.
A:casting interlocking components
B:welding plates to form sections for assembly
C:forging integral components
D:case hardening integral components

出自：海船船员证

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