等长收缩是指肌肉收缩时（）没有改变，而（）增加；等张收缩是指肌肉收缩时长度（）而（）没有改变。
地下水位下降会引起（） 土中总应力减小。 土中总应力增加。 土中有效应力减小。 土中有效应力增加。
You are managing a database for which incremental backups can be very time consuming. In order to perform optimized incremental backups you enable the block change tracking feature.How would you instruct RMAN to use the block change tracking feature when performing incremental backups？（） You need to mention it with every BACKUP command.。 The block change tracking feature is used automatically by RMAN.。 You need to configure it using the CONFIGURE command.。 You need to set the necessary initialization parameters to direct RMAN to use the feature.。
You are managing an Oracle Database 11g database with ASM storage. The ASM disk group has the COMPATIBLE.ASM attribute set to 11.1. Which statements are true regarding extent management and allocation units in the ASM disk group？（） The au_size disk group attribute determines the size of allocation units in the disk group. 。 The allocation unit size may vary but the extent size is fixed.。 The allocation unit size and extent size are fixed for all the disks in a disk group and cannot be changed.。 Extent management is completely automated.。
馈线到天线端的小区连接和机柜端的小区连接需（） 正确。 不需要对应。
Which two elements of the Java Enterprise Application Archive are required?（）
