1864年9月，在伦敦（）召开了声援波兰人民起义的国际性工人大会。
A.圣保罗教堂
B.圣约翰教堂
C.圣马丁教堂
D.海德公园
参考答案：C
The nurse is teaching a group of patient-care attendants about infection-control measures. The nurse tells the group that the first line of intervention for preventing the spread of infection is
A. wearing gloves.B. administering antibiotics.C. washing hands.D. assigning private rooms for clients.
水磨石机宜在混凝土达到设计强度（）时方可进行磨削作业。
A.60%～70%
B.65%～70%
C.70%～80%
D.75%～80%
