ECG-9620心电图机改变了以往对模拟信号的光电耦合，而通过对数字信号进行光电耦合确保了输出信号的线性要求。
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ECG-9620心电图机采用交直流两用电源，使用过程中遵循蓄电池优先的原则。
A. 对
B. 错
____ tries the most serious offenses such as murder and robbery.
A. Magistrates’ courts
B. Youth courts
C. District courts
D. The Crown Court
Which of the following is NOT a characteristic of British government?
A. It offers the Queen high political status and supreme power.
B. It is both a parliamentary democracy and a constitutional monarchy.
C. It has no written form of Constitution.
D. It is the oldest representative democracy
The United Kingdom of Great Britain and Northern Ireland is reigned over by, but ruled by.
A. the government/the monarch
B. the monarch/the government
C. the parliament/constitutional monarch
D. the cabinet/Queen Elizabeth
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