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66. Which of the following is TRUE of alternating current? a. It is produced by chemical means. b. It travels in only one direction. It

66. Which of the following is TRUE of alternating current? a. It is produced by chemical means. b." It travels in only one direction. It is most often found in batteries. d. It is a rapid, interrupted current. 67. For which of the following would microcurrent be MOST useful? a. removing the natural protective barrier of the skin b. slowing healing time for acne lesions C. decreasing muscle tone d. reducing redness and inflammation

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