汇票是信用证项下的必备单证。
our company has a DNS server named server1. Your partner company has a DNS server named server2. You create a stub zone on server1. The master for the stub zone is server2. Serve2 fails. You discover that users are not able to resolve named for the partner company. You need to ensure that users are able to resolve named for the partner company in the event that server2 fails. What should you do?（） ["Change the stub zone to a secondary zone on server1.","Open the SOA record for the zone on server2. Change the minimum (default ) TTL setting to 12 hours.","Open the DNS zone for the partner company on server2. Create a new route through (RT) record and a new host (A) record for server1.","Open the primary DNS zone on server2. Create a new service locator (SRV) record and a new host (A) record for server1."]
如何实现强密码保护（）。 ["使用不同的密码","妥善保存密码","设置强密码","告知他人密码"]
《续齐谐记》
水泥标准稠度净浆指标准维卡仪试杆沉入深度为距（）mm时的水泥净浆。 ["底板4±1","水泥浆表面4±1","底板6±1","水泥浆表面6±1"]
岩浆成矿作用主要分为哪几类？
