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问题 单项选择题

话音记录器的水下定位信标在水下工作时，将产生一个声脉冲信号，频率为（）.

A.27.5KHz

B.37.5KHz

C.27.5MHz

D.37.5MHz

答案

参考答案：B

判断题

去甲肾上腺素、肾上腺素和异丙肾上腺素均具有扩张骨骼肌血管的作用。
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单项选择题

Digital computer is controlled by internally stored programs and (66) of using common storage for all or part of a program and also for all or part of the data necessary for the execution of the programs; executing user-written or user-designated programs; performing user-designated manipulation of digitally represented discrete data, including. (67) operations and logic operations; and executing programs that (68) themselves during their execution.

Analog computer’s operations are analogous to the (69) of another system and that accepts, processes, and produces analog data.

(70) computer integrates analog computer components and digital computer components by interconnection of digital-to-analog converters and analog-to-digital converters.

（70）处填（）。

A．Mixed

B．Composite

C．Compound

D．Hybrid
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