切丝机刀片的磨削面如有烟垢而无亮面,则可判定该把刀()。
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商业银行省级分行为基本核算单位,而支行则为附属核算单位。()
A. 正确
B. 错误
外螺纹在垂直于螺纹轴线方向的视图中,表示牙底的细实线园画()圈。
A. 1
B. 1/2
C. 2/3
D. 3/4
Which two statements about the background process of the database writer are true()
A. It is possible to have multiple database writers in an Oracle instance.
B. It writes dirty buffers, if any, to data files whenever a checkpoint occurs.
C. It writes dirty buffers, if any, to data files whenever a transaction commits.
D. It writes dirty buffers, if any, to data files before the log writer (LGWR) write
轴流式基元级的进口速度三角形中的叶轮进口处空气绝对速度的轴向分速度代表().
A. 压气机空气流量大小
B. 压气机转速大小
C. 压气机轮缘功大小
D. 叶轮进口处空气预旋大小