【名词&注释】
胰岛素(insulin)、脑膜炎(meningitis)、乙型肝炎(hepatitis b)、青霉素(penicillin)、肾上腺素(epinephrine)、救生衣(life jacket)、先锋霉素(cephalosporin)
[单选题]The trend nowadays is to build the frame box as a separate fabricated construction and then, after stress relieving and machining the mating surfaces, to mount it on the _____. This has the advantage of saving weight.
A. seating
B. bed-plate
C. entablature
D. cylinder block