(1)結(jié)構(gòu)安排應(yīng)當(dāng)完整勻稱(2)結(jié)構(gòu)安排應(yīng)當(dāng)做到周嚴(yán)縝密(3)結(jié)構(gòu)安排應(yīng)當(dāng)做到錯(cuò)綜變化