下图中属于北方地区气候特征的是

1.Secure Net (SN) manufacture security cards that restrict access to government owned buildings around the world.The standard cost for the plastic that goes into making a card is $4 per kg and each card uses 40g of plastic after an allowance for waste. In November 100,000 cards were produced and sold by SN and this was well above the budgeted sales of 60,000 cards.The actual cost of the plastic was $5·25 per kg and the production manager (who is responsible for all buying and production issues) was asked to explain the increase. He said ‘World oil price increases pushed up plastic prices by 20% compared to our budget and I also decided to use a different supplier who promised better quality and increased reliability for a slightly higher price. I know we have overspent but not all the increase in plastic prices is my fault’The actual usage of plastic per card was 35g per card and again the production manager had an explanation. He said ‘The world-wide standard size for security cards increased by 5% due to a change in the card reader technology, however, our new supplier provided much better quality of plastic and this helped to cut down on the waste.’SN operates a just in time (JIT) system and hence carries very little inventory.Required:

(c) Assess the performance of the production manager. (8 marks)

如图为A、B、C在水中的溶解度曲线图：

（1）A、C交点的意义是                          ；

（2）t₃℃时，A、B、C三者的溶解度由大到小的顺序是   _______________；若在该温度时将45克A放入50克水 中， 形成的溶液是__   溶液（填“饱和”或“不饱和”）；

（3）如果有A、B的混合物（含少量的B），将A提纯的方法是          ；

（4）t₂℃时，等质量的A、B、C三种物质的饱和溶液，温度升高到t₃℃，所得溶液溶质质量分数由大到小的顺序是：                  。

小儿肠套叠中最常见的类型是（）

A.结肠型

B.小肠型

C.回盲型

D.回结型

E.回回型

塔的气速增高，气液相形成湍流的泡沫层，使传质效率提高，所以气速越大越好。

地球：宇宙

A．白云；大气

B．铅笔：钢笔

C．桌椅：教室

D．树木：树枝