神经—肌肉接头处传递中，消除乙酰胆碱的酶是A．磷酸二酯酶 B．腺苷酸环化酶 C．胆碱

凡是特定主体能够以货币表现的经济活动都是会计核算和监督的内容。 ( )

劳动争议仲裁委员会主任应由 ( )担任。

A．劳动行政部门代表

B．同级工会代表

C．用人单位代表

D．职工代表

女，39岁，诉下坠感，有尿液漏出。妇科检查：宫颈已脱出 * * 口6cm， * * 前后壁显露于 * * 口外，最佳治疗方案

A． * * 前后壁修补术

B． * * 前后壁修补+主韧带缩短、宫颈部分切除术

C．经 * * 子宫全切除+ * * 前后壁修补术

D．经 * * 子宫全切除+ * * 后壁修补术

E． * * 纵隔成型术

Peter and I ________ in the same class. ________ are good friends.      [ ]

A. are, Us        

B. are, We              

C. is, Our        

D. am, We

Frame Relay is simplified form of (51) , similar in principle to (52) , in which synchronous, frames of data are routed to different destinations depending on header information.

Packets are routed throught one or more Virtual Circuits known as (53) . Most Virtual Circuits are (54) , which means that the network provider sets up all DLCI connections at subscription time. (55) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.

（55）是（）

A. Permanent Circuits

B. Permanent Virtual Circuits

C. Switched Virtual Circuits

D. Switched Circuits