全陪应做好______和介绍工作,回答游客的问询,随机进行旅游______。
参考答案:宣传 调研
No one except two students _____ the meeting.[ ]
a. has been late for
b. have been late for
c. was late for
d. were later for
桅杆滑移法吊装是利用桅杆起重机提升滑轮向上提升这一动作,设置尾排及其他索具配合,将立式静置工件吊装就位。