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一、选择题:(每题3分,共30分)11下列说法中,正确的个数有()①-8是64的平方根;②64的平方根是-8;③一个数有两个平方根;④每个正数有且只有一个算术平方根A14个B13个C12个D11个21若a、b是有理数,则下列各数不一定是有理数的是()A1ab B1a+bC1(a+b)2D1ab31如图1是某蓄水池的横断面
First, the multiple-choice questions: (3 points for each question, a total of 30 points) 11 The following statements, the correct number of () 1-8 is 64 square root; 264 square root is -8; 3 a number has two square roots; 4 Each positive number has one and only one arithmetic square root A14 B13 C12 D11 21 If a and b are rational numbers, then the following numbers are not necessarily rational numbers () A1ab B1a+bC1(a+b)2D1ab31 Figure 1 is a cross section of a reservoir