由（）衍生而成的化合物均为萜类化合物，此类化合物结构种类虽然非常复杂，但其基本碳架多具有（）结构特征。
表面粗糙度的参数值越（），其表面光洁度越高，加工成本也越大。 小。 大。 多。
软件开发模型有几种？各自适合于什么场合？
You are a security administrator for your company. The company has one main office and five branch offices. Network administrators work in the main office and each branch office. Network administrators in the main office frequently create scripts that automate common administrative tasks. You review each script to ensure it does not introduce security vulnerabilities. Scripts that do not introduce security vulnerabilities are considered approved. Occasionally， branch office administrators modify these scripts and distribute the modified scripts to other branch office administrators. Branch office administrators often report that they accidentally run a modified version of a script. You need to ensure that branch office administrators can verify which scripts are approved scripts. What should you do？（） Maintain a list of the dates that the approved scripts were last modified. lnstruct branch office administrators to verif。 Digitally sign All approved scripts. Instruct branch office administrators to verify the signature before using a script.。 Distribute all approved scripts to branch office administrators in an e-mail message.。 Place all approved scripts on a file server in the main office. Assign All branch office administrators only the Allow -the approved scripts. Instruct administrators to copy scripts from this file server.。
什么是激素？激素在信息传递上的特点？激素作用的一般特性？
以下不是配送的定价方式的是（）。
