以下不属于包装物的有（）。 A.生产过程中领用的盛装物品 B.用于加工包装物的加工材

处于静止状态的某原子核X，发生α衰变后变成质量为M的原子核Y，被释放的α粒子垂直射人磁感强度为B的匀强磁场中，测得其圆周与运动的半径为r，设α粒子质量为m，质子的电量为e，试求：

（1）衰变后α粒子的速率υ_a和动能E_ka；

（2）衰变后Y核的速率υ_y和动能E_ky；

（3）衰变前X核的质量M_x．

患者男，60岁，因“进餐后出现持续胸痛伴大汗、恶心2h”来诊。患者既往有糖尿病病史3年，高血压病史12年。查体：BP100/70mmHg，HR120次/min；心电图：V1～V5ST段抬高0.2～0.4mV。

因患者家属不愿承担急诊治疗风险，要求药物保守治疗，遂继续给予药物治疗稳定病情，胸痛症状渐缓解。入院后第3天患者突然再发剧烈胸痛，同时合并端坐呼吸、肢端湿冷等表现，听诊胸骨左缘可闻及全收缩期吹风样杂音伴震颤，此时首先考虑的诊断为（）

A.左心室室壁瘤

B.室间隔穿孔

C.左心室破裂

D.急性心肌梗死

E.不稳定型心绞痛

Dolphins are interesting animals and researchers find them interesting to watch. They don’t have hands, but can use tools to solve problems, just like us. Scientists have observed a dolphin trying to get a shy eel(鳝鱼) to come out of its hole by poking(捅)it with a dead fish. Many species of dolphin live in large societies. They have many different relationships and need a good communication system; they use a variety of sounds to communicate with each other.

There is currently no evidence that dolphins have a language of their own. But scientists still have a lot to find out about these animals and so there are certain to be a few surprises in the future.

At Kewalo Basin Marine Laboratory in Hawaii, the dolphin team have developed a sign langue to communicate with the dolphins, and the results are amazing. Not only do the dolphins understand the meaning of individual words, they also understand the significance of word order in a sentence. For example, when they were asked to ‘touch the ball with your tail and then jump over it’ they generally responded correctly and straight away, which showed that they understood the langue.

Most mammals seem to enjoy play—but dolphins seems to like making their games as challenging as possible. On a beautiful day in 1997, researchers working at a beach, off the southern coast of Brazil, observed a little dog going into the sea and swimming towards the dolphins. To their surprise, the dolphins approached the dog and then started throwing it into the air. The dog seemed to enjoy the ‘game’ and continued playing with the dolphins for more than an hour. From then on, different dogs were seem trying to interact with the dolphins.

Dolphins live in a very different world to ourselves, but they are very good at our ‘intelligence tests’. For example, they will jump out of the water when they hear a whistle noise. They do this because they will get a fish as a reward. There is still much to learn about these flexible(灵活的)problem-solvers, but from the evidence so far, it would seem as though dolphins are very intelligent.

小题1:To get a shy eel to come out of its hole , a dolphin would poke it with____.

A．a tool

B．its tail

C．a dead fish

D．its mouth小题2:At a laboratory in Hawaii, the dolphin team have developed a ____ to communicate with the dolphins.

A．variety of sounds

B．sign language

C．special word order

D．dolphin’s language小题3:Dolphins not only understand the meaning of individual words, they also understand the importance of ______ in a sentence.

A．the subject

B．the verbs

C．the main structure

D．word order小题4:When they play, dolphins seems to like making their games as ______ as possible.

A．difficult

B．easy

C．interesting

D．relaxing小题5:Dolphins will jump out of the water when they hear a whistle noise in order to _______.

A．watch people

B．breathe fresh air

C．enjoy themselves

D．get some food

体内CO₂分压最高的部位是（）

A.静脉血液

B.毛细血管血液

C.动脉血液

D.组织液

E.细胞内液

咳嗽时喷出气体的速度很快，这个速度相当于光号列车速度的几倍？