單項(xiàng)選擇題金屬壓力表的讀值是:()

A.相對(duì)壓強(qiáng)
B.相對(duì)壓強(qiáng)加當(dāng)?shù)卮髿鈮?br /> C.絕對(duì)壓強(qiáng)
D.絕對(duì)壓強(qiáng)加當(dāng)?shù)卮髿鈮?/p>