A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）
Ⅰ.gap
Ⅱ.side

An acceptable means of tightening connecting rod and main bearing cap bolts is to measure the （）
Ⅰ.torque applied to each nut and bolt assembly
Ⅱstretch of each nut before and after tightening