Expressions of heat removal factor, efficientfactor and time constant of the four types of cavity receiver have been deduced and test for trough solar collector system has been set up.
Nevertheless, you may also want to introduce the human factor in the equation, so that you can also provide an efficient, easy, and pleasant interaction.
然而，您可能还想将人为的因素考虑进来，从而提供一个有效的、简单的并且舒适的交互作用。
3
Between 1975 and 1990 both Labour and total factor productivity actually fell in both industry and services (meaning that businesses became less, not more, efficient).