A new and distinct cultivar of Poinsettia plant named \u2018PER1904\u2019, characterized by its uniform, upright and mounded plant habit; freely branching habit; recurved dark green-colored leaves; mid-season flowering response; inflorescences with pink-colored flower bracts that are recurved; and excellent post-production longevity. In casewhere the returning speed is larger than a reference value, it is judged that the operator intends to decelerate a vehicle with an engine brake applied and the speed ratio of the continuously variable transmission is fixed to a value at the moment when the operator releases the accelerator pedal. It is envisioned that at least one marker may be used or any mixture of the four. In order to prevent the sticking phenomenon after the stop of the spray, the semiconductor physical quantity sensor is dried by spraying an inert gas such as nitrogen including minus ions so that the revolving SOI substrate can eliminate static electricity generated by friction of the air flow. The multiplexed laser source and external modulator can be used as separate apparatuses for reducing speckle in laser illumination.