【单选题】中国实现从“站起来”到“富起来”时间段是()
【单选题】From the first three paragraphs, we can infer that
A.
the author would prefer playing with his three older siblings to staying with his grandpa.
B.
they were living in the suburbs where there were not too much traffic on the road.
C.
the grandpa was always the one to babysit for the author and his siblings.
D.
the author enjoyed the time that he spent with his grandpa.
【单选题】We’ll have a sports meet for the next three days.________, we won’t have lessons for three days. [ ]
【判断题】限制梁柱的剪压比,主要是为了防止梁柱混凝土过早发生斜压破坏。()
【判断题】限制梁柱的剪压比,主要是为了防止梁柱混凝土过早发生斜压破坏。
【单选题】现测定套管换热器的总传热系数。数据如下:甲苯在内管中流动,流量为 5000kg ·h -1 , 甲苯的比热容为 1.89kJ × kg -1 × K -1 ,进口温度为 80 °C,出口温度为 50 °C;水在环隙中流动,进、出口温度分别为 15 °C和 30 °C。逆流流动,冷却面积为 2.5m 2 。求传热平均温度差和总传热系数
【单选题】中国实现从“站起来”到“富起来”的时间段是( )