400-1816-180
本題由chris提供
In a certain business, production index p is directly proportional
(1) e = 0.5 whenever i = 60.
(2) p = 2.0 whenever i = 50.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
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已知：p和e成正比，e和i也成比例，求i=70時(shí)p的值。 設(shè)：p=K1*e, e=K2i (K1,K2為比例系數(shù)) 代入可得：p=(K1K2)*i，設(shè)K1K2=K，則有p=Ki Statement (1) Alone 可以求出K2，K1未知，無(wú)法確定p和i之間的比例系數(shù)K，也就無(wú)法根據(jù)一個(gè)i的值確定p的值，所以不充分 Statement (2) Alone 可以直接求出K值，確定p=0.04i，將i=70代入求出唯一p=2.8，所以條件二充分
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