扫蒙金石颗粒粗细可根据需要而定，一般采用（）筛子进行筛选。
A. 10-25孔/cm2
B. 25-50孔/cm2
C. 50-75孔/cm2
D. 75-100孔/cm2
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对于一个稳态的流动传热现象而言，其准数方程式可表示为（）。
吸烟同时用口服复方避孕药是否会有危害，以下选项错误的是（）
A. 使心血管疾病发生的危险增加
B. 35岁以上每日吸烟多于15支者不建议服用
C. 35岁以下吸烟妇女应用时要认真随访
D. 不会有任何危害
You work as the Exchange administrator at Company.com.The Company.com network contains an Exchange Server 2010 Organization named Company.com.All Company.com users make use of their Personal Archive. A new Company.com directive states hat messages be moved from the mail box of users to their Personal Archive after 60 days.What should you do？（）
A. You should consider running the New Managed Content Settings wizard and creating a new managed folder mailbox policy.Thereafter the policy should be applied to all users.
B. You should consider creating a managed custom folder.Then the New Managed Content Settings wizard should be run and a journal rule created.
C. You should consider having a retention tag created.Then the retention tag should be assigned to a retention policy.Thereafter the retention policy should be applied to all users.
D. You should consider having a retention tag created.Then the retention tag should be assigned to a retention policy. Thereafter a journal rule should be created.
下列说法正确的有（）
A. 真理是具体的就是说真理是多变的
B. 价值是抽象的就是说价值是多维的
C. 主体结构和规定的复杂性导致主体的价值关系的全面性、多维性
D. 真理的具体性是说真理有其适用的具体范围和条件
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