为了保证装配后滚动轴承与轴颈和壳体孔台肩处紧贴,轴承的圆弧半径应()轴颈或壳体处的圆弧半径。
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Companycom has been performing scheduled backups of their data to tape using "tar" in a script for over one year with no problems. Recently, the tar command is returning a non zero return code during the backup phase, causing the script to fail. What is the primary cause of this problem?()
A. The files have grown to over eight gigabytes in size
B. The file systems are corrupt, and fsck should be run
C. The tape block size has been changed from the default
D. The user’s limit has been changed to less than eight gigabyte
临时接地线主要由软导线和接线夹头组成。其中,相同的三根软导线是接()用的,另一根软导线是接()用的。
A. 火线、零线
B. 零线、接地装置
C. 相线、接地装置
“六淫”指寒、热、温、凉、虚、实六种病症。
A. 正确
B. 错误
地层因素引起的井漏,一般利用()的方法进行堵漏。
A. 堵漏剂封堵漏失通道
B. 注水泥,下套管
C. 起钻静置
D. 改变钻井液性能和降低钻井液排量