Question 8 Briefly explain the following four ways that personal property may be used as security for debts: (a) Lien (b) Mortgage (c) Pledge (d) Charge
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【判断题】一对标准齿轮传动,若 z 1 < z 2 ,则其齿根弯曲应力一定是 s F1 < s F2 。
【简答题】The work done by aircraft mechanics and service technicians and reservation am transportation ticket agents and travel clerks in air transportation are called ______ occupations.