搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

关于空肠弯曲菌的培养特性，下列哪项是错误的（）

A.微需氧菌

B.最适生长环境是5％O2、85％N2、10％CO2

C.最适生长温度为32℃

D.营养要求高

E.初分离时出现两种菌落

答案

参考答案：C

单项选择题 A型题

下列哪种不属于右心室双出口的类型（）。

A.埃布斯坦型

B.法洛四联症型

C.左位型大动脉异位

D.艾森曼格型

E.右位型大动脉异位
查看答案
单项选择题

Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of (86) . This, in turn, limits the data rate that can be carried on the transmission (87) A square wave has an infinite number of frequency components and hence an infinite (88) However, the peak amplitude of the kth frequency component, kf, is only l/k, so most of the (89) in this waveform is in the first few frequency components. In general, any digital waveform will have (90) bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.

（89）是（）

A.frequency

B.energy

C.amplitude

D.phase
查看答案