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- Physical and chemical cleaning was used to el iminate membrane fouling. The results showed that the conventional physical clea ning is able to remove most of cake layer, but has little effect on membrane per meability recovery. 对污染膜进行物理和化学清洗试验表明,常规物理清洗可使滤饼层大部分脱落,但对膜过滤性能的恢复效果较差;
- The agency places about 2000 secretaries per annum. 该代理机构每年可为约2000名秘书安排工作。
- It travels thousands of miles per second. 它一秒钟能走几千英里。
- Can your car make a hundred miles per hour? 你的汽车一小时能开一百英里吗?
- These apples cost five yuan per kilogram. 这些苹果每公斤五元。
- We fail one student per year on average. 我们平均每年有一个学生不及格。
- The car is spinning along120 li per hour. 这车正以每小时120里的速度行进。
- The hurricane has a speed of 73 miles per hour. 飓风每小时73英里。
- Meals average out at 5 per head. 膳食平均每人5英镑。
- Pressure is force per unit area. 压力就是电单位面积上的力。
- The four and a half per cent bonds are in request. 利息四厘五的债券需求量大。
- Last year its retail price fell20 per cent. 去年，它的零售价格下降了百分之二十。
- A postman's wages are 180 per week. 邮递员的工资为每周180英镑。
- Per capita incomes rose sharply last year. 去岁人均收入剧增。
- The speed limit is 40 miles per hour. 规定的最高时速为40英里。
- Production costs dropped5.5 per cent last year. 生产成本去年下降了5。5％。
- She got a rake-off of 5 per cent from the deal. 她从这笔交易中获得百分之五的回扣。
- The cruiser's speed is 50 miles per hour. 巡洋舰的速度每小时有50海里。
- My savings account draws5 per cent interest. 我的储蓄存款有五厘利息。
- Water has a variable coefficient of expansion. 水的膨胀系数是可变的。
