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简述农业推广学的研究步骤。

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一切电话中断后,连续发出同一方向的列车时,两列车的间隔时间,应按区间规定的运行时间另加3min,但不得少于()。

A. 20min
B. 15min
C. 13min

A customer synchronizes the cluster in a virtualized environment. During the process the following warning isdisplayed: "For nodes with a single Network Interface Card per logical network configured, it is recommended to includethe file ’/usr/es/sbin/cluster/netmon.cf’ with a pingable IP address as described in the PowerHA PlanningGuide". What should the customer do next?()

A. Ignore the warning as synchronization completed successfully.
B. Populate the /usr/es/sbin/cluster/netmon.cf file with one or many IP addresses external to the cluster.
Create another virtual adapter on each node and set-up PowerHA networking in a more traditional fashion
D. Populate the /usr/es/sbin/cluster/netmon.cf file with any of the boot IP addresses on one of the othercluster node

以下描述错误的是()。

A. 开放式问卷答案无规范形式,回答较麻烦
B. 封闭式问卷答案受限定,容易回答且易统计
C. 封闭式问卷研究标准化程度高,但不如开放式问卷深入
D. 开放式问卷回收率高于封闭式问卷

有效知觉时间是指()。

A. 大脑有意识的时间
B. 能做出正确判断的时间
C. 能做出动作的时间
D. 能够自由活动的时间

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