【单项选择题】
At the top of the A-frames there is a strong cast iron frame called （）.
A、A.cylinder liner
B、B.cylinder cover
C、C.the gear box
D、D.the scavenging box
查看正确答案
A、top of the piston and bottom side of head, with the piston at BDC B、piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDC C、bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placement D、top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
