The convex platform at the front edge of the base-plate not only enhances the strength of the base-plate, but avoids clamping stagnation in the process of feeding paper, which is reliable.
底板前缘的凸台既加强了底板的强度，且在送纸时不会产生卡滞现象，使用可靠。
The diaphragm is formed to make maximum a difference in air pressure of the front surface and the rear surface of the diaphragm, thereby forming any one of concave and convex shapes thereof.
隔膜形成为使得隔膜的前表面和后表面的气压差最大，这样，从而形成它的凹形形状和凸形形状中的任意一个。
Methods Hypermetropia and myopia were induced by playing concave and convex lens in front of eyes of 32 subjects.
方法在正常眼前放置正、负球镜，人工诱导单纯性远视、近视性屈光参差。
Methods Hypermetropia and myopia were induced by playing concave and convex lens in front of eyes of 32 subjects.
方法在正常眼前放置正、负球镜，人工诱导单纯性远视、近视性屈光参差。
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