TKH4A型位置转换开关组装后,用塞尺检查主触指超程,在()。
A. l~2mm
B. 2~3mm
C. 3~4mm
D. 4~5mm
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防火阀平时呈开启状态,火灾时当管道内温度达到()℃时关闭。
A. 55
B. 60
C. 65
D. 70
Which describes the default behavior when you create a table? ()
A. The table is accessible to all users.
B. Tables are created in the public schema.
C. Tables are created in your schema.
D. Tables are created in the DBA schema.
E. You must specify the schema when the table is created.
在各种信息传递形式中,()是第一性的、最基本的手段。