注册会计师在对鉴证对象作出合理一致的评价时，需要有适当的标准。下列有关标准的说法中，

实验室常用______与______来制取二氧化碳，该反应的文字表达式为______．

肝气郁结型郁病的主症为

A．精神抑郁，情绪不宁，胸部满闷，胁肋胀痛，痛无定处，脘闷嗳气，不思饮食
B．性情急躁易怒，胸胁胀满，口苦而干，脉弦数
C．精神抑郁，性情急躁，头痛失眠，健忘，舌红有瘀点
D．精神抑郁，胸部闷塞，胁肋胀满，咽中如有物梗塞，吞之不下，咯之不出，脉弦骨
E．精神恍惚，心神不宁，多疑易惊，悲忧善哭，喜怒无常

证券营业部在经纪业务中由于给予客户融资、融券而可能给其带来的损失属于法律风险。

Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3). A transmission from any station propagates the length of the medium in both directions and can be received by all other  (4). At each end of the bus is a (5) , which absorbs any signal, removing it from the bus.

空白（1）处应选择（）

A.medium

B.connection

C.token

D.resource

正弦交流电电压的有效值U与幅值Um的关系是（）。

A、U=Um/

B、U=Um/

C、U=Um

D、U=Um