上行船在合理利用缓流时，应注意（）.①吃水增加②剩余水深的大小③首倾现象④尾倾现象⑤

一个长方形的宽是25厘米，比长短5厘米．这个长方形的周长是多少厘米？

The duty-paying value shall be ( ).

A．the value of imports or exports declared by the consignors or consignees

B．the true transaction value of imports & exports

C．the value higher than the transaction value of identical or similar goods

D．the value lower than the transaction value of identical or similar goods

钢梁弯曲检查的方法是用弦线或铁丝在杆件两端拉紧，量出各点的矢距，横向弯曲矢度小于自由长度的（）。

A、1/500

B、1/1000

C、1/1500

D、1/5000

The primary driver behind the demand for continual quality improvement is ______ .

A．an increase in the number of the projects being worked

B．widespread public interest in government cost improvement reports

C．the prevalence of media reports on quality circles and other quality improvement

D．the need to reduce the cost and ensure the performance of products

摘除草花枝条顶梢叫（）。

A.短截

B.摘心

C.除芽

D.剥蕾