A.五級B.八級C.十級D.十二級
A.不用檢定B.每個千斤頂進(jìn)行檢定C.宜進(jìn)行整體檢定,也可逐一檢定,且滿足相對誤差應(yīng)小于3%D.檢測或校準(zhǔn)示徝重復(fù)性不應(yīng)大于5%
A.30B.60C.90D.120