有径向流叶轮的水泵称为()。
A、离心泵
B、轴流泵
C、混流泵
参考答案:A
Visitors can stand on the top of Oriental Pearl Television Tower, from where they can have a better
______ of the city of Shanghai.[ ]
A. sight
B. scenery
C. scene
D. view
预应力混凝土工程施工技术日趋成熟,在预应力钢筋选用时,应提倡采用强度高、性能好的( )。
A.热处理钢筋 B.钢绞线C.乙级冷拔低碳钢丝 D.冷拉Ⅰ~Ⅲ级钢筋