Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（） When using versions of Java technology earlier than 5.0.。 When sharing a StringBuffer among multiple threads.。 When using the java.io class StringBufferInputStream.。 When you plan to reuse the StringBuffer to build more than one string.。
It has been determined that print jobs from an application are not being removed from the system after they have been printed. To remove these jobs from the /var/spool directory, which cron entry will remove files more than 7 days old?（） find /var/spool/lpd/qdir -mtime -7 -type f -exec rm -f {}\。 find -name /var/spool/* -f rm {}\。 find -name /var/spool/lpd/* -exec rm {}\。 find /var/spool/lpd/qdir -mtime +7 -type f -exec rm -f {}\。
T－101b开孔机的各部件在使用前后都要涂（），防止腐蚀。 黄油。 汽油。 机油。 防锈漆。
红细胞破坏后，Hb受何者吞噬（） 肝脾。 单核细胞。 中性粒细胞。 单核-巨噬细胞系统。
To examine the Exhibit， press the Exhibit button. While a user is compiling a C program， "vmstat 120 10" is run to determine the cause of a performance problem. Using the vmstat output as shown in the exhibit， which of the following conclusions is most appropriate to draw about the I/O bottleneck？（） The bottleneck is network I/O.。 The bottleneck is local disk I/O.。 The bottleneck is paging space I/O.。 The bottleneck is to a remote filesystem.。
按存在形态可以将资产分为（）。
