甲、乙、丙、丁拟设立一个有限合伙企业，合伙协议中约定了如下内容，其中符合合伙企业法律制度规定的有( )。

A．甲仅以出资额为限对企业债务承担责任，同时被推举为合伙事务执行人

B．乙为有限合伙人，乙在合伙企业存续期间不得从事同本合伙企业相竞争的业务

C．丙以其劳务出资，为普通合伙人，其出资份额经各合伙人商定为5万元，丙在合伙企业存续期间可以同本合伙企业进行交易

D．经全体合伙人同意，有限合伙人可以全部转为普通合伙人，普通合伙人也可以全部转为有限合伙人

Virtual reality (or VR (65) is kind of a buzzword these days in computer graphics.VR is artificial reality created by a computer that is so enveloping that it is perceived by the mind as being truly real.VR exists in many (66) .A traditional view of virtual reality uses headsets and data gloves.The headset serves as the eyes and ears to your virtual world,projecting sights and sounds generated by the computer.The data glove becomes your hand,enabling you to interact with this (67) world.As you move your head around,the computer will track your motion and display the right image.VR is the most demanding (68) for computer graphics,requiring hardware and software capable of supporting realtime 3D (69) .

68（）

A.App 

B.apply 

C.application 

D.appliance