Wine, flowers, ______ foods, and small items for the house all make good hostess gifts.
A. feature
B. quality
C. specialty
D. characteristic
Ustilago maydis侵染引起()。
A. 玉米瘤黑粉病
B. 玉米丝黑穗病
C. 玉米大斑病
D. 玉米小斑病
Na2S 溶液的质子条件式为
A. c(H+ )+ c(HS- ) + 2 c(H2S) = c(OH- )
B. c(H+ )+c(Na+ ) = c(HS - )+2 c(S2- ) + c(OH- )
C. c(H+ )+ c(H2S) = c(HS - ) +2 c(S2- )+ c(OH- )
D. c(H+ )+ c(HS- ) + c(H2 S) = c(OH- )
Please RSVP ____ Thursday, February 16. We hope to see you there!
A. before
B. on
C. by
D. after