Nhận biết (M1)

Piezoelectric harvesters convert kinetic energy (resonance) to electrical energy, precluding the need for external electrical sources. The vibration of a spacecraft, for example, can provide sufficient energy to power many of its sensors piezoelectrically. A newly designed piezoelectric harvester incorporating a highly conductive carbon-fiber-reinforced polymer (CFRP) electrode has been shown to provide steady energy loads during resonance, an absolute prerequisite for wireless communication devices to be powered piezoelectrically.

Which finding, if true, would most directly support the text's claim about wireless communication devices?

• A.

  The near-constant kinetic vibration of a spacecraft makes it possible to power its wireless communication devices using only non-CFRP piezoelectric harvesters.

• B.

  The high conductivity of the CFRP is what makes the energy output from a piezoelectric harvester sufficient for wireless communication devices.

• C.

  Intermittent or unpredictable electrical supply undermines the efficacy of wireless communication devices.

• D.

  The CFRP electrode is incompatible with most wireless communication devices.