哪些商品不能全数检验而只能抽样检验？
Which two of these are characteristics of MPLS VPNs？ （） [" Layer 3 MPLS VPNs can forward only IP packets"," Layer 2 MPLS VPNs can forward any network protocol"," MPL S label paths are automatically formed based on Layer 2 frames"," Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 frames"," In Layer 2 MPLS VPNS， the service provider controls the customer Layer 3 policie"]
核酶（）
简述商品分类的原则。
在采用变动成本法计算的企业中，单位产品的标准成本中不包括（）的标准成本。 ["直接材料","直接人工","变动制造费用","固定制造费用"]
功能柱
