digital l pH-meter 数字式酸碱计
This effort has included attempts to modify for unmanned flight the MiG-21 (ph) and with greater success an aircraft called the L-29 (ph).
这些无人飞行器中包括改进的无人飞行器米格-21和称之为L-29的飞机。
Pomerranz, Kenneth L. "The Making of a Hinterland: State, Society and Economy in Inland North China, 1900-1937", Ph. D. Dissertation, Yale University, 1988.
彭慕兰：《腹地之构建：1900—1937年华北内地之国家、社会与经济》，耶鲁大学博士论文，1988年。
Kenneth L. Cavanaugh, Ph. D. is Professor of Applied Statistics and Senior Research Scientist, Institute of Science, Technology and Public Policy.
肯尼思·卡瓦诺博士是应用统计学教授、科学、技术与公共政策学高级研究员。
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