医生时常提醒老人和儿童要适当到室外照射阳光,这个说法的原理就是太阳光中的紫外线能促进人体维生素D的生成,从而使得钙能更好地被人体所吸收。你觉得这个说法对吗?
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A company is installing IP phones. The phones and office computers connect to the same device. To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect the phones and computers, and what technology should be implemented on this device? (Choose two.)()
A. hub
B. router
C. switch
D. STP
E. subinterfaces
F. VLAN
粘度的表示方法很多,归纳可分为两种()。
A. 绝对粘度
B. 动力粘度
C. 运动粘度
D. 恩氏粘度
连续高速长距离运行,轮胎容易发生热剥离、剥离爆裂。
A. 正确
B. 错误