Optimization criterion for unit quantity of heat economy benefit in irreversible carnot cycle 不可逆卡诺循环火用经济优化准则
For tobacco , hydrocarbon oil and methyl alcohol , duties are charged at specific rates per unit quantity 烟草、碳氢油类及甲醇之税款乃按每单位数量之特定税率缴付。
Available in 100 - unit quantities , these covers fit securely into the disposable cuvette to provide a seal that protects against sample spillage if the cuvette is dropped or tipped over 这些盖子可以安全地密封我们的通用试管,即使试管跌落或倾倒过来,其中的样品也不会流出。