單項(xiàng)選擇題液體中某點(diǎn)的絕對(duì)壓強(qiáng)為100kN/m2,則該點(diǎn)的相對(duì)壓強(qiáng)為:()(注:當(dāng)?shù)卮髿鈮簭?qiáng)為1個(gè)工程大氣壓)

A.1kN/m2
B.2kN/m2
C.5kN/m2
D.10kN/m2