Which statement is true about the data traffic between the access point named TKAP1 and controller TKC1？（）
A. The data traffic between the access point and controller is not encrypted.
B. The data traffic is encapsulated with LWAP
C. The data traffic is switched at the access point before being sent to the WLAN controller where VLAN tagging and QoS are applied.
D. The data traffic is encrypted with AE
E. All of the above
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A thrust block is designed to（）.
A. transmit the thrust of the engine to the propeller
B. transmit the thrust of the propeller to the vessel
C. absorb the shock of wave pressure at the bow
D. be placed between the engines and the foundation to absorb the vibratio
下列哪项不属于质量改进的意义（）
A. 质量改进是企业在激烈竞争中生存和发展的保证
B. 质量改进是社会科学进步的表现
C. 质量改进是企业不断满足顾客需求的需要
D. 质量改进是消除慢性浪费、提高企业竞争力的重要手段
卷绕机中下列传感器是属于接近开关的有（）。
A. B41
B4
C. S55
D. B1
消防手套的主要用途及要求是手部及腕部防护。
A. 正确
B. 错误
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