重度贫血A．外周血血红蛋白为～90g/LB．外周血血红蛋白为～60g/LC．外周血血

纸币的发行量必须以国家规定的量为限度。 [ ]

合同或信用证要求两份或两份以上正本，且难以更改合同或信用证的，经审批同意，可以签发，但应在第二份证书正本上注明( )。

A．“本证书是××号证书的另一正本”

B．“本证书是××号证书正本的重本”

C．“本证书是××号证书的第二份正本”

D．“本证书是××号证书正本的复本”

An analog signal’s characteristic quantity representing data may (66) . at any instant, any value within a continuous (67) . For example, an analog signal may follow continuously the values of another physical quantity representing data.

A discrete signal is composed of (68) elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform, (69) , and position in time. A digital signal is a special case of discrete signals, in which data are represented by a (70) number of well-defined discrete values that one of its characteristic quantities may take in time.

（67）处填（）。

A．interval

B．region

C．range

D．compartment

下图是患甲病（显性基因为A，隐性基因为a）和乙病（显性基因为B，隐性基因为b）两种遗传病的系谱图。

Ⅱ－3和Ⅱ－8两者的家庭均无乙病史，则乙病的致病基因位于（）染色体上，为（）性基因

潜伏期3～7天为（）。

A.淋病

B.尖锐湿疣

C.非淋菌性 * * 炎

D.梅毒

E.生殖器疱疹