伦巴与西班牙和非洲的舞蹈有密切关系。16世纪随着殖民主义者贩卖黑奴而将非洲舞蹈传入拉丁美洲。因此,()就成为伦巴舞的发源地。
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只要橡套电缆型号相同,即使其截面不同也可以直接连接。()
A. 正确
B. 错误
在清洗空气制动系统中的两个变向阀时,其O形圈上允许涂加(),用以润滑。
A. 航空汽油
B. 高端煤油
C. 甘油
D. 凡士林
TestKing.com has two SQL Server 2005 computers named SQL1 and SQL2. A user in TestKing.com named Eric writes many ad hoc queries against the company databases.Eric has access to the Customer database on SQL1. He does not have access to the Sales database on SQL2. You need to ensure that Eric can write queries that join information from both servers. What should you do first?()
A. Create a linked server on SQL1 to SQL2. Configure the linked server to use impersonation.
B. Create a linked server on SQL1 to SQL2. Configure the linked server to use mapped logins.
C. Instruct Eric to write the queries on SQL2 by using the OPENQUERY statement and specifying SQL1 as the server name.
D. Instruct Eric to specify SQL Server object names by using four-part notation.
ZD6系列电动转辙机主轴组由主轴套止挡栓和()组成。
A. 滚动轴承
B. 主轴
C. 挡圈
D. 锁闭齿轮