运行和旋转机构的第一级啮合齿轮，当齿厚磨损量达原齿厚的25_%时，齿轮应报废。

I ______ in No.46 Junior High School for four years. Now I have been a student of Tieren Senior High School for three months.

A have studied      B had studied      C was studying      D studied

若某排气筒的排放为间断性排放，排放时间小于1h，应在排放时段内实行连续采样，或在排放时段内以等时间间隔采集（）样品，并计平均值。

A.3个

B.4个

C.1～3个

D.2～4个

It depends on the government's measures ____ the housing price will be brought under control by

the end of this year. [ ]

A. how

B. that

C. whether

D. when

学业评价

用信管理，是指信贷业务审批后按照信贷批复要求落实信用发放条件，签订合同（协议），办理抵、质押担保手续，放款审核和发放信用等信贷业务实施工作。