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2  è?????

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3  é“?é’‰

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4  é“?é’‰??”

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????°?è·????D	??·é“?	20	24	26	28
	???é“?	20	26	30	35

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é“?é’‰??????d	8	10	12	14	16
é“?é’‰??”??????D	8.5	11	13	15	17
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4.5 ?????????

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4.5.2 é?????è?…é…??—?é“?é’‰??”?…?è?????????¤§????§?é??(é”????é??)???1.6mm?????????é?¤????§????é???”¨?????”????????”???é“°????????”?????????è??é“?é’‰è??é???????’?…????é“?????????“?????‘

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5  é“????

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5.6 ???é“?é“?é’‰???????????????800???~900???????????¨500???????????????é“????è???¨????é“?????????“?????‘

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é“??????????p(??¨)	??·é“?	26	28	35	48
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