与教育概念相比,培训特点相应体现为:多涉及专题性学习活动;培训目标更为具体;培训更注重技能的培养。
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按照通信传播方式的不同,计算机网络可分为()和()网络两大类。
预防性维护是为消除设备失效和生产的计划外中断的原因而策划的措施。
A. 正确
B. 错误
Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true?()
A. The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.
B. The DHCP Discover message uses UDP as the transport layer protocol.
C. The DHCP Discover message uses a special Layer 2 multicast address as the destination address.
D. The DHCP Discover message uses TCP as the transport layer protocol.
E. The DHCP Discover message does not use a Layer 2 destination address.
F. The DHCP Discover message does not require a transport layer protocol.
灯光回路的绝缘电阻会随着回路的运行时间增加而降低,每年通常会出现()的衰减。