大架上绷绳滑轮内孔磨损不大于()毫米。
A、2
B、3
C、5
参考答案:B
______ interested us most was ______ he saw last night.
A.It; what
B.What; what
C.What; how
D.It; how
对儿童少年进行生长发育调查,调查的时间最好是()。
A.4~6个月或8~10个月
B.5~7个月或9~11个月
C.4~7个月或9~10个月
D.5~6个月或8~10个月
E.5~6个月或9~10个月