多接口关联可以生成信令流程图，并可进行双击消息跳转，查看具体的消息解码。

为了防治月饼变质，通常在月饼的包装中放入一小袋的“防腐剂”，这种“防腐剂”是铁粉．试分析这种防腐剂防止月饼变质的化学原理______．

铜钱在历史上曾经是一种广泛流通的货币，已知铜的熔点是1083.4℃、铁的熔点是1538℃．试从物理性质和化学性质的角度分析，为什么用铜而不用铁来铸造货币？

从物理性质分析：______；

从化学性质分析：______．

阅读理解。

      Short and shy, Ben Saunders was the last kid in his class picked for any sports team. "Football, tennis

Cricket-anything with a round ball, I was useless, "he says now with a laugh. But back then he was the

object of jokes in school gym classes in England's rural Devonshire. 

     It was a mountain bike he received for his 15th birthday that changed him. At first the teen went biking

alone in a nearby forest. Then he began to cycle along with a runner friend. Gradually, Saunders set his mind

building up his body, increasing his speed, strength and endurance. At age 18, he ran his first marathon.

      The following year, he met John Ridgway, who became famous in the 1960s for rowing an open boat

across the Atlantic Ocean. Saunders was hired as an instructor at Ridgway's school of Adventure in Scotland,

where he learned about the older man's cold-water exploits (成就). Intrigued, Saunders read all he could about

Arctic explorers and North Pole expeditions, then decided that this would be his future.

     Journeys to the Pole aren't the usual holidays for British country boys, and many people dismissed his

dream as fantasy."John Ridgway was one of the few who didn't say, 'You are completely crazy,' Saunders

says.

     In 2001, after becoming a skilled skier, Saunders started his first long-distance expedition toward the North

Pole. He suffered frostbite, had a closer encounter (遭遇) with a polar bear and pushed his body to the limit.

     Saunders has since become the youngest person to ski alone to the North Pole, and he's skied more of the

Arctic by himself than any other Briton. His old playmates would not believe the transformation.

      This October, Saunders, 27, heads south to explore from the coast of Antarctica to the South Pole and back, an 1800-mile journey that has never been completed on skis.

1. The turning point in Saunders' life came when  _____.

A. he started to play ball games

B. he got a mountain bike at age 15

C. he ran his first marathon at age 18

D. he started to receive Ridgway's training

2. We can learn from the text that Ridgway _______.

A. dismissed Saunders' dream as fantasy

B. built up his body together with Saunders

C. hired Saunders for his cold-water experience

D. won his fame for his voyage across the Atlantic

3. What do we know about Saunders?

A. He once worked at a school in Scotland.

B. He followed Ridgway to explore the North Pole.

C. He was chosen for the school sports team as a kid.

D. He was the first Briton to ski alone to the North Pole.

4. The underlined word "Intrigued" in the third paragraph probably means _____.

A. Excited  

B. Convinced

C. Delighted

D. Fascinated

5. It can be inferred tat Saunders' journey to the North Pole ______.

A. was accompanied by his old playmates

B. set a record in the North Pole expedition

C. was supported by other Arctic explorers

D. made him well-known in the 1960s

腰椎间盘突出的临床体征中，最有意义的是( )

A．腰椎侧突
B．腰部活动受限
C．压痛和骸棘肌挛缩
D．直腿抬高试验阳性
E．直腿抬高试验及加强试验阳性

所有计费用电流互感器的二次接线应采用分相接线方式。（）