An acceptable means of tightening connecting rod and main bearing cap bolts is to measure the ()<br /> Ⅰ.torque applied to each nut and bolt assembly<br /> Ⅱstretch of each nut before and after tightening
A、Ⅰonly
B、Ⅱ only
C、both Ⅰ and Ⅱ
D、neither Ⅰ nor Ⅱ