通常生理学的研究方法分为三个水平，即（）、（）和（）。
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You are a network administrator of a large investor relations company that uses a switchednetwork to carry both data and IP telephony services. Why should you carry voice traffic on aseparate VLAN？（）
A. IP phones require inline power and must be in separate VLAN to receive inline power
B. IP telephony applications require prioritization over other traffic as they are more delaysensitive
C. IP phones can only receive IP addresses through DHCP if they are in separate VLAN
D. The CDP frames from the IP phone can only be recognized by the switch if the phone is in anauxiliary vla
《西洲曲》抒写的是（）
A. 少女对情郎的无尽思恋
B. 游子对家乡的无尽思恋
C. 妻子对丈夫的无尽思念
D. 儿子对父母的无尽思念
单层砌体房屋计算简图中，柱下端应算至（）。
A. 室外地面下500mm处
B. 埋置较深时取基础顶面
C. 室内地面下500mm处
D. C均不对
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