金刚石钻进即小口径钻进,只能施工Φ75以下小直径钻孔。
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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
一肿瘤组织实际深度为5CM,其中电子束穿过肺的厚度为2CM,问治疗的有效深度为()
A. 4.0cm
B. 4.5cm
C. 3.0cm
D. 3.5cm
E. 3.6cm
在集体教学活动过程中,教师应发挥学前儿童的主动性、积极性和创造性,使学前儿童真正成为学习的主体。
A. 正确
B. 错误