这种速热水箱，加热效率高、省电、使用成本低、便于推广应用。
The kind of fast hot water tank, heats up the efficiency high, saves the electricity, the use cost is low, is advantageous for the promoted application.
这种速热水箱，加热效率高、省电、使用成本低、便于推广应用。
The quick water heating tank with high heating efficiency, low use cost and saving of electricity is convenient for popularization and application.
瓶盖的锁紧和松开装置设计合理，制做简单，成本低廉，便于推广应用。
The tool for closing and opening can bottle cap has advantages of reasonable design, simple manufacture, and low cost.
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