单项选择题

机构具有确定相对运动的条件是( )。 A.
机构的自由度数目等于主动件数目 B.
机构的自由度数目大于主动件数目 C.
机构的自由度数目小于主动件数目 D.
机构的自由度数目大于等于主动件数目

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A．直角扣件
B．旋转扣件
C．对接扣件
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The following statements relate to business objectives:
(i) The short-term objectives of an organisation are described in very general terms.
(ii) Corporate objectives relate to the organisation as a whole.
(iii) It is possible for a division of an organisation to have its own specific objectives.
Which of the above are correct?

A．(i), (ii) and (iii)
B． (i) and (iii) only
C． (i) and (ii) only
D． (ii) and (iii) only