single-U groove with sloping sides是什么意思

用法例句

Establishes an experiment system for single U tube,double U tube and tube-in-tube heat exchangers,studies the variation of the heat exchange with time during heat pump continuous and intermittent operating separately.

搭建了实验台,研究了单U形管、双U形管和套管换热器分别在热泵连续运行与间歇运行方式下换热量随时间的变化趋势。