2016年底中国首款按照最新国际适航标准研制的干线民用飞机()将实现首飞。
A. B747
B. C919
C. A380
D. A330
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对大中型项目工程,结构复杂的重点工程除必须在施工组织总体设计中编制施工安全技术措施外,还应编制单位工程或分部分项工程安全技术措施。
A. 正确
B. 错误
金刚石钻进即小口径钻进,只能施工Φ75以下小直径钻孔。
A. 正确
B. 错误
Which statements regarding the server parameter file (SPFILE) are true()
An SPFILE is a binary file.
B. An SPFILE cannot reside on a client.
C. An SPFILE cannot contain static parameters.
D. An SPFILE can store changes persistently across instance restarts.
E. An SPFILE can be read by the database server, but it is not written to by the server.
F. An SPFILE must be created manually, before creating a database, even if you use the DatabaseConfiguration Assistant (DBCA) to create the database
当制动轮平面度误差不超过0.8ram,可用()在外网磨床上修磨制动轮摩擦表面。
A. 心轴
B. 砂纸
C. 磨轮