leaving velocity 中文意思是什麼
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Using a simulation of physical model and according to the analogical principle, a simplified double - layer model of the surface and roadbed of concrete highway is established, practical methods of distinguishing the reflected ultrasonic wave, measuring the velocity of the reflected ultrasonic wave and the time parameter, which the ultrasonic wave takes from leaving source to the received by receiver, are put forward
摘要利用模擬物理模型，並根據相似性原則建立起公路路面和路基的雙層簡化模型，提出了一種準確識別反射波，測量反射波速率及走時參量的實用方法。 -
The 6. 8 mm remington spc is limited to relatively short bullets to fit within the maximum cartridge length of 5. 56 mm weapons, so the grendel has a shorter ( 39 mm ) and fatter case, leaving room for longer, low - drag bullets, which retain their velocity out to long ranges
8毫米的雷明頓spc缺少相配套的短彈頭使之合適於5 . 56毫米武器的最大彈藥筒尺寸，因此格倫德爾的彈殼更短（ 39毫米）更胖一點，為遠距離低阻彈頭留出空間。
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