单项选择题
A.small than
B.more than
C.little than
D.less than
单项选择题 The compressed air is supplied by （） to the air reservoirs.
单项选择题 The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its （）.
单项选择题 The complete assembly of bedplate, A-frames and cylinder block is held together by （） to form a rigid structure.