脚手架立杆接长,顶层顶步可采用搭接,搭接长度不应小于()m
参考答案:1m
The president said that it was a great honor for him ______ his country in the past two weeks.
A.to visit
B.to be visiting
C.to have visited
D.to have been visited
根据以下资料,回答131-135题。
2001~2015年间,新能源汽车五种技术专利申请数均高于上年的年份有()个?
A.7
B.8
C.9
D.10