7\u7c73\u957f\u7684\u60ac\u7a7a\u5927\u6881\u8981\u600e\u4e48\u5e03\u7f6e\u94a2\u7b4b

7\u7c73\u8de8\u5ea6\uff0c\u6881\u9ad8 = 7000/12=583.3\uff0c\u6881\u662f50\u4e00\u4e2a\u6a21\u6570\uff0c\u6240\u4ee5\u6881\u9ad8\u5e94\u8be5\u2265600mm\u3002
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\u6269\u5c55\u8d44\u6599\uff1a
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\u5f53\u94a2\u7b4b\u516c\u79f0\u76f4\u5f84\u4e0d\u5927\u4e8e12mm\u65f6\uff0c\u76f8\u5bf9\u808b\u9762\u79ef\u4e0d\u5e94\u5c0f\u4e8e0.055\uff1b\u516c\u79f0\u76f4\u5f84\u4e3a14mm\u548c16mm\uff0c\u76f8\u5bf9\u808b\u9762\u79ef\u4e0d\u5e94\u5c0f\u4e8e0.060\uff1b\u516c\u79f0\u76f4\u5f84\u5927\u4e8e16mm\u65f6\uff0c\u76f8\u5bf9\u808b\u9762\u79ef\u4e0d\u5e94\u5c0f\u4e8e0.065\u3002
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\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1--\u94a2\u7b4b

\u6846\u67b6\u5927\u7ea6\u57287\u7c73\u957f\u7684\u8fc7\u6881\u8981\u7528\u591a\u5927\u7684\u94a2\u7b4b
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\uff082\uff09\u8bc4\u62f1\u7816\u8fc7\u6881 \u5c06\u7816\u4fa7\u780c\u800c\u6210\u3002\u7070\u7f1d\u4e0a\u5bbd\u4e0b\u7a84\uff0c\u7816\u5411\u4e24\u8fb9\u503e\u659c\u6210\u62f1\uff0c\u4e24\u7aef\u4e0b\u90e8\u6df1\u5165\u5899\u518520-30mm,\u4e2d\u90e8\u8d77\u62f1\u9ad8\u5ea6\u4e3a\u8de8\u5ea6\u76841/50\u3002\u4f18\u70b9\u662f\u94a2\u7b4b\u3001\u6c34\u6ce5\u7528\u91cf\u5c11\uff0c\u7f3a\u70b9\u662f\u65bd\u5de5\u901f\u5ea6\u6162\uff0c\u8de8\u5ea6\u5c0f\uff0c\u6709\u96c6\u4e2d\u8377\u8f7d\u6216\u534a\u7816\u5899\u4e0d\u5b9c\u4f7f\u7528\u3002
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