We conclude that both high myocardial adenosine level and high vagal tone may result in sinus bradycardia and A-V block.

实验结果提示：高腺苷含量及高迷走神经张力均可以起窦性心率减慢及房室传导阻滞。

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Usage: suitable for precise lathing of rotor outer circle and commutator that with big shaft diameter and V block can not be used.

用途：适用于V型块无法使用的较大轴径的转子外圆或换向器的精车。

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Compared with the traditional jig using V-block, this jig is of simple structure and easy assembling.

与V形块定位夹具相比，该夹具具有结构简单、制造及装配工艺性好等特点。

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Use controls: Tools like the V-Chip or services offered by your cable provider let you block content you don't want your kids to see on TV.

CNN: Is media violence damaging to kids?

The V-chip, imposed on TV makers in 1996 to let parents block raunchy shows, is a flop in the marketplace (parental groups claim the rating system is inaccurate, rendering the chip moot).

FORBES: Filth and the FCC