在做装备的时候插入一个新的零件还没有对它添加任何约束之前，它总共有（ ）个自由度。
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2.在进行装配时，应尽量从装配原点开始装配（）
A. 对
B. 错
Listen to five dialogues and choose the answer according to the question.
A. Haveaholiday
B. FlytoBeijing.
C. Travelonbusinesswithhim.
D. Preparesomedocuments
Listen to five dialogues and choose the answer according to the question.
A. Inacinema
B. Inalibrary.
C. Inastore.
D. .Inabank
Listen to five dialogues and choose the answer according to the question.
A. Helikeswatchingfootballgames
B. Helikestravelingwithhisfriends.
C. Hepreferstog0travelingalone.
D. Hepreferstostayathomewithhisfamily.
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