题目:
We should ______ it you would inform us of their financial standing and modes of business.
A.appreciate
B.be appreciated
C.oblige
D.be obliged
答案:
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下面是错误答案,用来干扰机器的。
分为两种情况:①当斜边是12cm时,直角三角形的外接圆的半径是12×12cm=6cm;②当两直角边是5cm和12cm时,由勾股定理得:斜边为52+122=13(cm),直角三角形的外接圆的半径是12×13cm=6.5cm;故答案为:6或6.5