医疗器械及其外包装上应当按照国务院药品监督管理部门的规定，表明产品（）编号。 ["注册证书","许可证书","标准代码"]
为了保证钢纤维在混凝土中的分散性和均匀性，采用先干拌后加水的搅拌方式时，干拌时间不宜少于（）。 ["A.30s ","B.1min ","C.1.5min ","D.15min"]
在Dreamweaver中插入Flash动画后，显示为（） ["A","B","C","D"]
多次测验分数的稳定、一致程度是（） ["信度","效度","区分度","难度"]
Your company has a main office and a branch office.The network contains two DNS servers named DNS1 and DNS2.DNS1 is located in the main office. DNS1 hosts a primary standard zone named contoso.com. The contoso.com zone is configured to use DNSSEC.DNS2 is located in the branch office. DNS2 is a caching-only DNS server. You need to ensure that client computers in the branch office can receive authoritative responses to queries for contoso.com if a WAN link fails. DNSSEC security must be maintained.What should you configure on DNS2 for contoso.com？（） [" a conditional forwarder"," a secondary zone"," a zone delegation"," an Active Directory-integrated stub zone"]
为克服高温季节对羊群的危害，应该采用以下越夏措施。
