漏料斜度
参考答案：
漏料斜度是刃壁以下凹模孔的每侧斜度。漏料斜度用以使废料或工（序）件畅通坠落
Mary bought three pairs of sports shoes the other day, but ______ is expensive. [ ]
A. none of which
B. neither of which
C. none of them
D. neither of them
在劳动人事关系存续期间，由于特殊情况的发生，合同当事人可以（）履行合同规定的义务。
