【简答题】一高压管末端接喷嘴,如下图所示,已知喷嘴出口直径为10cm,管道直径为40cm,水在管中流量Q为0.4 m3/s,则管嘴对水流的作用力为( )。【图片】
【简答题】一高压管末端接喷嘴,如下图所示,已知喷嘴出口直径为10cm,管道直径为40cm,水在管中流量Q为0.4m 3 /s,求管嘴对水流的作用力。
【多选题】下列属于低温热水地板辐射采暖系统安装主控项目要求的是( )。
B.
分、集水器型号。规格公称压力及安装位置高度等应符合设计要求
C.
加热盘管弯曲部分不得出现硬折弯现象,曲率半径应符合相关规定
D.
防潮层、防水层、隔热层及伸缩缝应符合设计要求
E.
盘管隐蔽前必须进行水压试验,试验压力为工作压力的1.5倍,但不小于0.6MPa
【单选题】H10.mp3: Circle the correct letter A - C. 20. What team sports does Mr. Thomas say are played at the school? A. Rugby, soccer and American football. B. Basketball and water polo. C. Soccer and cricket...
A.
Rugby, soccer and American football.
B.
Basketball and water polo.
【单选题】下列关于细石混凝土防水层定额套用说法,不正确的是( )
【判断题】轴力图可显示出杆件各段内横截面上轴力的大小但并不能反映杆件各段变形是伸长还是缩短。
【单选题】一高压管末端接喷嘴,如下图所示,已知喷嘴出口直径为10cm,管道直径为40cm,水在管中流量Q为0.4 /s,管嘴对水流的作用力最接近的为( )。
【多选题】H10.mp3: Questions 13 and 14: Circle Two letters A - E. Why did the school move out of London? A. The surroundings had become unpleasant. B. It was given some cheap land in east England. C. An English...
A.
The surroundings had become unpleasant.
B.
It was given some cheap land in east England.
C.
An English millionaire gave the school 65 million pounds.
D.
The Second World War started.
E.
Sir Gifford Reade was a generous man.
【单选题】H10.mp3: 16. Circle the correct letters A - C. In 1858, the school had ________. A. just female students. B. just male students. C. both male and female students.
C.
both male and female students.
【多选题】下列情形中,属于刑事诉讼法规定的公安司法机关受案来源有(