公路工程定额按用途分类分为()定额、()定额和()定额和()。
查看答案
由三个频率相同、电势振幅相等、相位互差120度角的交流电路组成的电力系统,叫()。
焊接延迟裂纹是一种()
A. 冷裂纹
B. 热裂纹
C. 再热裂纹
D. 层向撕裂
The primary reason low pressure evaporators produce distillate more efficiently, and with
A. evaporation is accomplished in a vacuum
B. due to the higher temperature of the incoming feed
C. due to the latent heat of evaporation principle
D. evaporation in a submerged medium produces more distillate
节能管理中计量准确即是要求大厦或园区内包括应急回路、备用回路在内的所有回路主要设备实现分_____、_____;计量数据安排专人定期_____、_____。