But distilling tower temperature control is a typic big time-lag system, and the control of it is always a difficult problem in coak producing industry.
但由于氨塔温度控制属于典型的大时滞系统,对这种系统的自动控制一直是焦化生产控制中的一个难题。
Retirement-typically at age 65-brings a sharp decrease in personal income. Social Security benefits usually cannot make up the difference. Older people may suffer from poor nutrition, medical care and housing.
退休通常在六十五岁的时候使个人收入骤减,而社会保障制度的福利并不能补足差额,老年人常遭遇营养、医疗照顾、和居住环境的问题。
objective to evaluate the value of diagnosis of non-typical symptom cholecystitis by uhrasouic murphy's sign.
目的评价超声莫菲氏征对 非 典型症状型胆囊炎的诊断价值.
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