Objective To understand and evaluate electrocardiography feature and clinical manifestation of atrioventricular junctional double layer block.

目的进一步认识和评价房室交界区双层阻滞的心电图改变和临床意义。

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Objective To explore electrocardiogram feature of non-alternating Wenchebach atrioventricular double layer block and it's clinical significance.

目的探讨表现为非交替性文氏周期的房室交接区双层阻滞的心电图特点和临床意义。

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Next is the block device drivers layer, which contains the various block drivers for underlying devices.

接下来是块设备驱动器层，它包括针对底层设备的各种块驱动器。

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The launcher shoots the bottles at a velocity of 984 feet per second, fast enough to smash a double-layer breeze-block wall and allow assault troops to enter a building, according to the manufacturer, BCB International.

FORBES: Wacky Weapons #1: Water Cooler Bombs Blow Holes in Walls