【单选题】从企业网络营销的策略来看,( ) 是企业开展网络营销的综合工具。
【单选题】Directional intake ports in diesel engines are used to _____.
A.
reduce air charge turbulence
C.
deflect hot combustion gas away from the valves
D.
oppose the effects of piston induced squish
【单选题】下列骨性标志中,哪一种在体表摸不到( )
【单选题】HTML文件就是网页文件,它的扩展名通常为( )。