利用N₂和H₂可以实现NH₃的工业合成，而氨又可以进一步制备硝酸，在工业上一般可进行连续生产．请回答下列问题：

（1）已知：N₂（g）+O₂（g）═2NO（g）△H=+180.5kJ•mol^-1

N₂（g）+3H₂（g）⇌2NH₃（g）△H=-92.4kJ•mol^-1

2H₂（g）+O₂（g）═2H₂O（g）△H=-483.6kJ•mol^-1

若有17g氨气经催化氧化完全生成一氧化氮气体和水蒸气所放出的热量为______；

（2）某科研小组研究在其他条件不变的情况下，改变起始物氢气的物质的量对N₂（g）+3H₂（g）⇌2NH₃（g）反应的影响，实验结果如图2所示：（图中T表示温度，n表示物质的量）

①图象中T₁和T₂的关系是：T₁______T₂（填“＞”、“＜”、“=”或“无法确定”）

②比较在a、b、c三点所处的平衡状态中，反应物N₂的转化率最高的是______（填字母标号），

③在起始体系中加入N₂的物质的量为______mol时，反应后氨的百分含量最大．若容器容积为1L，n=3mol反应达到平衡时H₂的转化率为60%，则此条件下（T₂），反应的平衡常数K=______；

（3）N₂O₃是一种新型硝化剂，其性质和制备受到人们的关注．

①一定温度下，在恒容密闭容器中N₂O₃可发生下列反应：2N₂O₃⇌4NO₂（g）+O₂△H＞0下表为反应在某温度下的部分实验数据则50s内NO₂的平均生成速率为______

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.

6（）

A．questions

B．inquiries

C．problems

D．complaints