喷油泵出油阀的作用是（）。 防止高压油管中的燃油回流。 提高喷油压力。 增加喷油量。 防止喷油器出现滴油现象。 提高喷油雾化质量。
工信部制定了《全国人大常委会关于维护互联网安全的决定》等30部针对互联网的（），基本形成了专门立法和其他立法相结合、涵盖不同法律层级、覆盖互联网管理主要领域和主要环节的互联网法律制度。 法律。 行政法规。 司法解释。 部门规章。
心理咨询人员的基本态度包括：（）、（）和律师的态度等。
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You suspect that a hacker may be performing a MAC address flooding attack somewhere within the network. Which description correctly describes a MAC address flooding attack？（） The attacking device spoofs a source MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.。 Frames with unique， invalid destination MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.。 The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the destination address found in the Layer 2 frames sent by the valid network device.。 The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the source address found in the Layer 2 frames sent by the valid network device.。 The attacking device spoofs a destination MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.。 Frames with unique， invalid source MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.。 None of the other alternatives apply。
“我（赫鲁晓夫）还记得那段时间，在经济崩溃和大饥荒之后，城市忽然恢复了生机，涌现出了各种产品，价格开始回落。这当然足一种退却，但它却帮助我们从国内战争的后遗症中恢复过来，积蓄了力量。”下列对“积蓄了力量”的理解，正确的是（）。
