可能引发药物过敏的是（） A.Ⅰ型变态反应 B.Ⅱ型变态反应 C.Ⅲ型变态反应 D.

除去下列物质的杂质（括号内物质为杂质），写出所加试剂的化学式及有关反应的离子方程式．

（1）FeCl₂（CuCl₂）试剂______离子方程式______

（2）NaCl（Na₂SO₄）试剂______离子方程式______．

无因管理是指无法定或约定的义务而为他人管理事务。关于无因管理所生之债的法律适用，国际上有不同的主张，我国法律在相关问题上( )

A．适用无因管理行为实施地法律

B．没有规定

C．适用支配原法律义务或关系的法律

D．适用本人的住所地法律

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.

1（）

A．push

B．pull

C．drag

D．toss

在客户机/服务器计算模式中，标识一个特定的服务通常使用( )。

A．TCP或UDP端口号

B．IP地址

C．CPU序列号

D．MAC地址