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甾体激素类药物可用紫外分光光度法测定含量,他们的λmax在( )
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A （1） is a collection of logically related data （2） that is organized so that its contents can easily be （3）, managed and updated.Database is often abbreviated （4）.Traditional databases are organized by （5）, records and files. A field is a single piece of （6）;a （7） is onecomplete set of fields; and a （8） is a collection of records. For example, a telephone book is analogous to a file. It contains a （9） of records, each of which consists of three fields:name, address and telephone number.A database consists of one or more files.For （10）, database of hospital includes a telephone book and a drug list,etc.
指出配位键的形成条件及其表示方法。
质量数为37的原子，应该有（）
下列关系正确的是（）
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