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. Given the vmstat output as shown in the exhibit， which of the following conclusions should be drawn about the I/O bottleneck？（） There is a file I/O bottleneck.。 There are too many open files.。 There appears to be a buffer shortage.。 There is a paging space I/O bottleneck.。
在管线高压不停输封堵施工作业时，应先提升（）封堵头。 上游。 下游。 上下游同时进行。 没有先后顺序。
自阀手柄移到紧急制动位，制动管压力为零时，降压风缸的压力为（）。 0kPa。 24kPa。 280~840kPa。 240~260kPa。
体育教师教学评价主要对教师的（）和（）两个方面进行。
In a store based on the consumer direct model， which roles have the ability to change shipping preferences and tax settings？（） Seller。 Operations Manager。 Product Manager。 Category Manager。 Customer Service Supervisor。
When configuring the messaging system， which of the following are valid parameters for the file transport？ （）
