血清中游离形式的镁占血清总镁的（）

[问答题]Since moving pictures were invented a century ago, a new way of distributing entertainment to consumers has emerged about once every generation. Each such (1)____(innovate) has changed the industry irreversibly; each has been (2) acco____ by a period of fear mixed with exhilaration. The arrival of digital technology, (3)____ translates music, pictures and text into the zeros and ones of computer language, marks one of those (4) p____.　　This may sound familiar, because the digital revolution, and the explosion of choice that would go with it, has been shown for some time. In 1992, John Malone, chief executive of TCI, an American cable giant, welcomed the “500-channel universe.” Digital television was about to deliver everything (5)____ pizzas to people's living rooms. When the entertainment companies (6)____(try) out the technology, it worked fine-but not at a price that people were prepared to pay.　　Those 500 channels eventually arrived but via the Internet and the PC (7)____ than through television. The digital revolution was starting to affect the entertainment business in (8)____(expect) ways. Eventually it will change every aspect of it, from the way cartoons are made to the way films are screened to the way people buy music. That much is clear. (9)____ nobody is sure of is how it will affect the economics of the business.　　New technologies always contain within them both (10) th____ and opportunities. They have the potential both to make the companies in the business a great deal richer, and to sweep them away. Old companies always fear new technology.

[多选题]属于受限空间场所的有（）等。

[填空题]人力资本理论认为，____是现代经济增长的重要因素，甚至是首要因素。

[单选题]上述说明脾虚子肿病机的是（　　）。

[单选题]铸铁锅炉（）时，应当进行锅片或者锅炉的冷态爆破验证试验，并且由具有相应资格的设计文件鉴定单位现场见证

[单选题]保险从业人员职业道德的职能和作用的发挥，主要依靠（）来实现。

[多选题]建造师责任风险的客观原因主要表现在如下几个方面（）

[单选题]当喷射飞机在高空划过时所形成的细长而稀薄的云叫做（）

[单选题]抗体鉴定必须采用的试验方法是（）。

[单选题]某企业2001年销售某产品的销售收入为元，销售该产品的利润为16.600元，该产品的销售利润率为（）。