砷化物中毒有效解毒剂（）。 A.亚硝酸异戊酯 B.二巯基丙磺酸钠 C.肉毒多效价抗毒

依据房产税相关规定，下列说法，正确的有（ ）。

A．房产税的征税范围包括农村

B．房屋产权出典的由出典人缴纳房产税

C．老年服务机构自用的房产免征房产税

D．专门经营农产品批发市场使用的房产在限定年度内免征房产税

E．中国人民银行总行所属分支机构自用房产免征房产税

  We are all busy talking about and using the Internet. But how many of us know the history of the Internet?

At first the Internet was only used by the goverment . 小题1: But in the early 1970’s , universities, hospitals and banks are allowed to use it , too . However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990’s, computers became cheaper and easier to use. Scientists had also developed software that made “surfing” the Internet more convenient.

小题2:Today it is easy to use the Internet and sending e-mail is more and more popular among students. The Internet has now become one of the most important parts of people’s life.

设随机变量X服从正态分布N(μ，σ²)，σ＞0，F(x)是X的分布函数，随机变量Y=F(X)，试求：

E(X+Y)；

组织内的声衰减程度的一般规律下列哪项是错误的

A．血液较肝脏声衰减小B．肝脾比骨组织衰减程度大
C．液体内含蛋白成分的声衰减增加D．肌肉组织比肌腱衰减小
E．组织内含胶原和钙质越多，声衰减越大

冷筛运转中发生异常响声原因（）。

A、飞轮配重不合适

B、偏心距不合适

C、轴承磨损严重