强制式水冷系的冷却强度不能随发动机负荷和水流大小而变化。
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YB55型小盒透明纸包装机拉线安装时要使有胶的一面接触拉线辊。
A. 正确
B. 错误
What is the function of the command switchport trunk native vlan 999 on a Cisco Catalyst switch（）。
A. It creates a VLAN 999 interface.
B. It designates VLAN 999 for untagged traffic.
C. It blocks VLAN 999 traffic from passing on the trunk.
D. It designates VLAN 999 as the default for all unknown tagged traffic.
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