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问题 单项选择题

下列可按生产领用量抵扣委托加工收回已纳消费税的有( )。

A．汽车制造厂将委托加工收回的小客车改装成救护车

B．化妆品厂将委托加工收回的已税酒精作为生产护肤品的材料之一

C．首饰厂将委托加工收回的已税珍珠抛光打孔串成珍珠项链

D．首饰厂将委托加工收回的已税钻石制成24K黄金镶嵌戒指

答案

参考答案：C

选择题
如图所示，AB是一质量为m的均匀细直杆，A端靠在光滑的竖直墙壁上，B端置于水平地面上，杆身与竖直方向夹角为θ，杆与地面的摩擦系数为μ，保持平衡，则此时杆与地面的摩擦力为（　　）

A．mgtgθ

B．mgsinθ

C．μmg

D．μmg
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单项选择题

(51) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.

(52) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

(53) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.

(54) is the popular LAN developed under the direction of the IEEE802.5.

(55) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

（55）是（）

A.X.25

B.ATM

C.FDDI

D.SMDS
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