题目内容

Which of the following is not the reason why Sarah and Walter lost contactwith each other?

A. Sarah’s letters somehow never reached Walter.
B. Sarah had moved away from her old address.
C. New York is a rather large town.
D. Walter came in to Sarah’s old address one week ago.

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What helped Walter finally find Sarah?

A. Sarah’s letters
B. Conversation with the owner
C. The bill of fare in the restaurant

1.铣削主要是加工（），也可加工（）。

2.铣床夹具的特点是（）与（）及（）相连接，随工作台作（）进给运动。

3.铣削时，影响加工精度的因素中，与夹具有关的因素有三项:（）、（）、（ )。