問題詳情
16. As a safety measure, the detonator for a nuclear device may be made of _____ each of which is controlled by a differentemployee.
(A) two equipments
(B) two equipment pieces
(C) two pieces of equipments
(D) two pieces of equipment
參考答案
答案：D
難度：簡單0.706667
統計：A(6),B(2),C(9),D(53),E(0)
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