题目内容

What is the passage mainly concerned with？

A. The benefits of trees.
B. Trees and soil protection
C. The various uses of trees.
Different attitudes toward trees.

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A．shape B．tumor C．thing D．group

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Henry Manley had no idea at all why George Strong wanted to see him.

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每一垫铁组应尽量减少垫铁的块数,且不宜超过(),并少用薄垫铁;放置平垫铁时,最厚的应放在下面,最薄的且不小于2mm放在中间,并应将各垫铁相互用定位焊牢,但铸铁垫铁可不焊。

A. 四块
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