1952年《老人与海》发表后，桑提亚哥形象的成功塑造，不仅使海明威笔下的“硬汉”形象

左侧卧位可使腹痛减轻提示何种疾病 （）

A.十二指肠淤滞症

B.胰体癌

C.反流性食管炎

D.胃黏膜脱垂

E.胃溃疡

临床通常掌握的根管充填的时机，除外（）

A.无自觉症状

B.无明显叩痛

C.无严重气味

D.无大量渗出液和急性根尖周症状

E.细菌培养阴性

More and more residences, businesses, and even government agencies are using telephone answering machines to take messages or give information or instructions. Sometimes these machines give (1) instructions, or play messages that are difficult to understand. If you (2) telephone calls, you need to be ready to respond when you get a (3)

The most common machine is the (4) used in residence. If you call a home (5) there is a telephone answering machine (6) you will hear several rings and then a recorded message that (7) says something like this: "Hello. We can’t come to the (8) right now. If you want us to call you back, please leave your name and number after the beep." Then you will hear a "beep", (9) is a brief, high-pitched (10) . After the beep, you can say who you are, whom you want to speak to, and what number the person should call to (11) you, or you can leave a (12) . Some telephone answering machines record for only 20 or 30 seconds after the beep, (13) you must respond quickly.

Some large businesses and government agencies are using telephone answering machines to provide information on (14) about which they receive a large volume of (15) . Generally speaking, using these systems (16) you to have a touch-tone phone ( a phone with buttons rather than a rotary dial). The voice on the machine will tell you to (17) a certain button on your telephone if you want information on Topic A, another button for Topic B, and so on. You listen (18) you hear the topic you want to learn about, and then you push the (19) button. Immediately after making your (20) , you will hear a recorded message on the topic.

12（）

A．repairing

B．recovering

C．retelling

D．recording

瓦斯爆炸的浓度为（）

A.5-16%

B.5-20%

C.3-18%

制冷系统为了防止发生压缩机液击现象，应装设的部件是（）。

A.油分离器

B.油分离器

C.电磁阀

D.气液分离器

E.高低压力继电器