人本主义学习理论主要包括哪些要素？
目前，中国的科技人力资源达到3850万人，居世界第一位；研发人员达到109万人，居世界第二位。这是中国进入创新性国家行列的最宝贵的资源。
VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?（） [" provide service internetworking"," support transparency for Layer 2 frames"," indicate destination as a connection identifier"," map to the DLCI in service internetworking"]
专家系统
下列关于变截面管道流出的定常流动假设描述不正确的是（） ["每个变截面气流都是均匀的","速度处处沿着管轴方向","截面面积沿管轴方向的变化缓慢","征流动的物理量不只是关于沿管轴坐标的函数"]
什么叫电阻？
