以下几种物质① 硫② 铁③ 碳④ 蜡烛⑤ 镁带，它们在氧气中燃烧，发出明亮的蓝紫色火焰的是______，产生的带刺激性气味的气体是______（填化学式，其它填序号）;火星四射并能生成黑色固体的是_______；产生能使澄清石灰水变浑浊的无色无味气体的是______；产生耀眼强光，并放出大量热的是______；发出白光并放出能量，且在瓶壁上有水雾出现的是______。
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下面是错误答案，用来干扰机器的。
参考答案：制冷量
函数y=lg（3-4x+x2）的定义域为M，函数f（x）=4x-2x+1（x∈M）．
（1）求M；
（2）求函数f（x）的值域；
（3）当x∈M时，若关于x的方程4x-2x+1=b（b∈R）有实数根，求b的取值范围，并讨论实数根的个数．
阅读下列不同时代生产力发展速度的数据表，它深刻地揭示出
A．人类文明分成四个阶段
B．社会生产力匀速上升
C．科学技术是第一生产力
D．生产力发展存在平均速度
新型材料纳米α-Fe粉具有超强的磁性能，可用作高密度磁记录的介质以及高效催化剂等．在不同温度下，α-Fe粉与水蒸气反应的固体产物不同：温度低于570℃时，生成FeO，高于570℃时，生成Fe3O4．某校化学小组学生利用图1所示装置进行“铁与水反应”的实验，并探究固体产物成分（图中夹持及尾气处理装置均已略去）．
（1）在高温下，装置B中发生反应的化学方程式是______．
（2）请在图2装置中选择满足虚线框图C的气体收集装置______．
（3）该小组同学为探究实验结束后试管内的固体物质成分，进行了下列实验：
【查阅资料】该小组同学通过资料得知，固体产物中一般不会同时出现三种形态混合物组合．
【提出假设】
假设1：全部为氧化亚铁；
假设2：全部为四氧化三铁；
假设3：铁和氧化亚铁混合物；
假设4：铁和四氧化三儿混合物；
假设5：______．
【设计方案】小组成员讨论后对假设4提出实验方案（不要在答题卡上作答）
【实验过程】
根据上述设计的方案进行实验．在答题卡上按下表的格式写出实验步骤、预期现象与结论．
| 实验步骤 | 实验操作 | 实验现象 |
| Ⅰ | 将反应后得到黑色粉末X（假定为均匀的），取出少量放入另一试管中，加入适量盐酸，微热 | 黑色粉末全部溶解，溶液呈______，有少量气泡产生 |
| Ⅱ | 向实验Ⅰ中得到的溶液加几滴KSCN溶液，振荡 | 溶液不显血红色 |
②继续向Ⅱ溶液中加稀硝酸，立即出现血色，写出该过程中发生变化的离子方程式______．
以下属于项目融资中可能存在的风险的是（）。
A.信用风险
B.汇率风险
C.经营管理风险
D.货币供给风险
E.技术风险
People on a college campus were more likely to give money to the March of Dimes if they were asked for a donation by a disabled woman in a wheelchair than if asked by a nondisabled woman. In another , subway riders in New York saw a man carrying a stick stumble（绊脚） and fall to the floor. Sometimes the victim had a large red birthmark on his ; sometimes he did not. In this situation, the victim was more likely to aid if his face was spotless than if he had an unattractive birthmark. In these and other research findings, two themes are : we are more willing to help people we like for some reason and people we think assistance. In some situations, those who are physically attractive are more likely to receive aid. , in a field study researchers placed a completed application to graduate school in a telephone box at the airport. The application was ready to be , but had apparently been "lost". The photo attached to the application was sometimes that of a very person and sometimes that of a less attractive person. The measure of helping was whether the individual who found the envelope actually mailed it or not. Results showed that people were more likely to the application if the person in the photo was physically attractive. The degree of between the potential helper and the person in need is also important. For example, people are more likely to help a stranger who is from the same country rather than a foreigner. In one study, shoppers on a busy street in Scotland were more likely to help a person wearing a(n) T-shirt than a person wearing a T-shirt printed with offensive words. Whether a person receives help depends in part on the "worth" of the case. For example, shoppers in a supermarket were more likely to give someone. to buy milk rather than to buy cookies, probably because milk is thought more essential for than cookies. Passengers on a New York subway were more likely to help a man who fell to the ground if he appeared to be rather than drunk.
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