low-quality

To solve the problems of low quality, low efficiency and high cost of steel mesh reinforcement used in the mines, one kind of special spotwelder was developed.

要为解决矿山用钢筋网架生产过程中出现的产品质量差、效率低、成本高等问题，研制出一种专用钢筋网架焊机。

We must not only focus on the construction of energy-efficient to reduce energy use, but also must consider as a low quality (moronity value of the conversion rate) energy.

建筑节能不仅要着眼于减少能源的使用，也虑尽量采用低品质（低能值转换率）的能源。