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下述距离，哪一项适用于四肢摄影（）。
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设函数f(x，y)在闭圆域x2+y2≤1上有连续一阶偏导数，且|f(x，y)|≤1，求证：在开圆域x2+y2＜1内至少存在一点(x0，y0)，使 [f′x(x0，y0)]2+[f′y(x0，y0)]2＜4．
Directions: Read the following passages and determine whether the sentences are " Right" or "Wrong". If there is not enough information to answer "Right" or "Wrong", choose "Doesn’t say". Then mark the corresponding letter on the ANSWER SHEET by drawing a single line through the center.Passage One The BIS is the central bankers’ central bank. It is very discreet, and very influential. It was founded in 1930 to act as a trustee for the loans associated with the Young Plan for Germany Reparations. The first members of the bank were the central banks of Belgium, France, Germany, Italy, Japan and the United Kingdom, together with three private U. S. banks. The Federal Reserve Bank subsequently became a member alone with all the major European central banks. Current membership consists of 30 central banks, of which 25 are European plus the United States, Canada, Australia, and South Africa. (The BIS was unique in having Alhania and South Africa as co-member. ) The board of directors is composed of the governors of the central banks of Belgium, France, Germany, Italy, and the United Kingdom, together with co-opted directors from among the governors of those member central banks that do not have a representative on the board. The BIS has three main functions. It acts as a bank, primarily as a central bankers’ bank; it acts as a gathering place for central hankers, a vehicle for international monetary cooperation; and it acts as trustee for various international loans. The BIS’s role as an intermediary provides a number of advantages to other central banks. The first is anonymity : sometimes it is not convenient for a central bank to be seen to withdraw its funds from the market. The second is risk spreading: a deposit with the BIS is very safe since the bank is highly liquid. Finally, deposits placed with the BIS can usually be withdrawn at very short notice. As a central bankers’ bank, BIS holds routine meetings to coordinate activities for international Monetary understanding.
2，6，11，17，25，36，52，（）
Passage Three Assets are the economic resources of the business that can be usefully expressed in monetary terms. Liabilities, or creditors, equity, are the obligations, or debts, that the firm must pay in money or services at some time in the future. They therefore represent creditor’s claims on the assets of the firm. The owner’s interest is equal to the net assets of the business, which is defined as the difference between the assets and liabilities. Thus, owner’s equity is the residual claim--a claim to the assets remaining after the debt to creditors has been discharged. Assets and liabilities of a firm are both shown on the firm’s balance sheet.
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