据说，美国研制出一种用超声波做子弹的枪．当超声波达到一定强

据说，美国研制出一种用超声波做子弹的枪．当超声波达到一定强度时就能有较强的攻击力．实际要阻挡这一武器的袭击，只要用薄薄的一层（）科网

A．半导体 B．磁性物质 C．真空带 D．金属物质

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据说，美国研制出一种用超声波做子弹的枪．当超声波达到一定强

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