补写出下列名句名篇中的空缺部分。 (1)，以手抚膺坐长叹。 (2)，一夫当关，万

()是建立在法人的组织信誉上，属于法人企业，出资者一般承担有限责任。

A.单个业主制企业

B.合伙制企业

C.公司制企业

D.自然人企业

20世纪70年代数据库系统语言协会(CODASYL)下属的数据库任务组(DBTG) 提出的DBTG系统代表哪种数据模型

A．关系数据模型

B．层次数据模型

C．对象数据模型

D．网状数据模型

尊重对方私隐权要做到“八不问”，“八不问”的内容不包括（）

A.年龄不问，收入不问

B.婚姻不问，业务不问

C.地址不问，经历不问

D.穿着不问，爱好不问

Nuclear power’s danger to health, safety, and even life itself can be summed up in one word: radiation.

Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can’t be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can’t detect them, sense them, without a radio receiver. Similarly, we can’t sense radio activity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things.

At very high levels, radiation can kill an animal or human being outright by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be significant. This is the case when only a few cells are hit. And if they are killed outright, your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in a deformed way. They can grow into cancer. Sometimes this does not show up for many years.

This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can he irradiated and feel fine, then die of cancer five, ten, or twenty years later as a result. Or a child can be born weak or liable to serious illness as a result of radiation absorbed by its grandparents.

Radiation can hurt us. We must know the truth.

Radiation can cause serious consequences at the lowest level（）

A. when it kills few cells

B. if it damages the few cells

C. though the damaged cells can repair themselves

D. unless the damaged cells can reproduce themselves

全固形物是（）的含量，单位以（）表示。全固形物是由水样蒸干后烘干并称重残留物测得。