Techniques are described herein to connect customers of a company with one another. The pharmaceutical preparation including, as active ingredients, a therapeutically effective amount of trichloroacetic acid and hydrochloric acid, or trichloroacetic acid and formic acid or all three of these acids and optionally a crosslinkingfixatingpreserving agent. The first control line is electrically connected with the switch units and the driving unit. The first input stage is turned on in response to a first bias voltage in the first gain mode and the second input stage is turned on in response to a second bias voltage in the second gain mode.