【单选题】设A= a x + a -x 2 ,B= a x - a -x 2 ,C= B A ,a>0,则下列三个结论中正确的个数是( ) (1)A 2 -B 2 =1 (2)A -2 -C 2 =1 (3)C -2 -B -2 =1.
【简答题】The traditional Chinese lunar calendar divides the into 24 solar terms( 节气 ).Awakening of Insects falls on March 6 and ends on March 20 this year. Awakening of Insects 1 a rise in temperature and incr...
【单选题】Who can tell me the reason ____ we see the lightning before we hear the thunder?
【单选题】下列三个结论中正确结论的个数( ) (1)直线 的横裁距等于2 (2) (3)角-390°与330°的终边相同
【单选题】下列三个结论中,正确结论的个数为 ( ) 1不等式 的解集为 ; 2 ; 3不等式 的解集为 。
【简答题】I. Fill in the blanks with proper prepositions. 1. He was indifferent _______ his personal appearance even in formal situations. 2. Something is wrong _______ her eyesight. 3. Students should not be t...
【简答题】Alex saw some________(mouse) running across the floor. 2. We have four ________(class) this morning. 3. Accurate ______(datum) covering the fact are not obtainable. 4. Thunder and lightning are _____...
【单选题】下列三个结论中正确结论的个数是 (1)函数f(x)= 的定义域是(1,2) (2,3); (2)若
【单选题】下列三个结论中正确结论的个数是( ) (1) . (2)若 ,则 是第二或第三象限的角. (3)点 在角 的终边上.
【单选题】下列三个结论中正确结论的个数( ) (1)若 ,则 是第一象限的角 (2) (3)角-30°与1050°的终边相同