In the author's opinion, Peter Fern must have married for ______.
A.his wife might hate climbing mountains
B.his wife might be from a rich family
C.his wife might be from a French mountaineer family
D.his wife might stop his risky adventures
第3题
为了保证被联接件经多次拆装而不影响定位精度,可以选用()。
A.圆柱销
B.圆锥销
C.开口销
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