ISDN是指（） 电话业务网。 电视业务网。 手机业务网。 综合业务数字网。
症状与植物病害的诊断：
Which of the following statements is true when the database is in ARCHIVELOG mode and tablespaces are in hot backup mode？（） Archive log generation is suspended until the tablespaces are taken out of hot backup mode. 。 Datafiles are not written to during hot backups.。 Changes to the database are cached during the backup and not written to the datafiles to ensure that the datafiles are consistent when recovered.。 The datafile headers are not updated during the backup.。 The way data is written to the online redo logs is unchanged during the backup.。
品德的特征包括个体性和（） 整体性。 主体性。 稳定性。 道德性。
同一焊件，夏天焊接选择的焊接电流应比冬天焊接电流要（） 大。 小。 一样。
Given:
Which code fragment, inserted at line 23, allows the code to compile?（）
