In all the leads of ECG,all following are pos | vedclass

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(B) In an $ECG$ (Electrocardiogram),the $P$ wave represents atrial depolarization,the $QRS$ complex represents ventricular depolarization,and the $T$

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$Q$

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(B) In an $ECG$ (Electrocardiogram),the $P$ wave represents atrial depolarization,the $QRS$ complex represents ventricular depolarization,and the $T$ wave represents ventricular repolarization.In the standard $ECG$ leads,the $P$ wave,$R$ wave,and $T$ wave are typically recorded as positive deflections (upward waves).The $Q$ wave is the first negative deflection of the $QRS$ complex,representing the depolarization of the interventricular septum.Therefore,$Q$ is a negative wave.

In all the leads of $ECG$,all following are positive waves except

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