岩石的比面越大,孔隙表面越多,可以吸附的化学药剂就越多,直接影响化学方法采油的药剂吸附量。
A. 对
B. 错
_______youarefree,willyoucomeskatingwithus?
A. Becauseof
B. Since
C. Though
D. although
Henryshouldgotothelibrarynextweekto_______thosebooks.
A. replace
B. alter
C. return
D. publish
Thereare________dressmakersintheUSthaninEuropeancountries.
A. farfewer
B. sofewer
C. asfewer
D. toofewer