The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.

时间：2019-04-13 21:41:32 关键词：they,that,at

The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.

A.so a height

B.such a height

C.so high

D.such high

答案解析

B

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