外商投资企业进口货物须向检验检疫机构申请价值鉴定。()
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What are some virtues of implementing end-to-end VLANs？（）
A. End-to-end VLANs are easy to manage.
B. Users are grouped into VLANs independent of a physical location.
C. Each VLAN has a common set of security and resource requirements for all members.
D. Resources are restricted to a single location.
皮带机在输送物料中，有时会混有金属杂物，如不及时发现就会划伤皮带造成事故，因而安装（）可将金属杂物及时清除。
果蔬汁饮料可以补充（）。
A. 脂溶性维生素
B. 水溶性维生素
C. 矿物质
D. 膳食纤维
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