沪科版数学九年级下册综合学情评估卷（含解析）

沪科版数学九年级第二学期综合学情评估卷 一、选择题(本大题共10小题，每小题4分，共40分) 1．下列几何体中，俯视图是三角形的是(　　) INCLUDEPICTURE"期末+5.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\期末+5.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\期末+5.tif" \* MERGEFORMATINET 2．“琴棋书画”中的棋是指围棋，围棋起源于中国，至今已有四千多年的历史．下列由黑、白棋子摆成的图案中，是中心对称图形的是(　　) 3．下列描述的事件中，是随机事件的为(　　) A．万无一失 B．水中捞月 C．守株待兔 D．旭日东升 4．如图，点A，C，B在⊙O上，已知∠AOB＝∠ACB＝α，则α的值为(　　) A．135° B．120° C．110° D．100° INCLUDEPICTURE"19AHXD91.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\19AHXD91.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\19AHXD91.tif" \* MERGEFORMATINET (第4题)　　　　INCLUDEPICTURE"066.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\066.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\066.tif" \* MERGEFORMATINET (第5题) 5．如图，一飞镖游戏板由大小相等的小正方形格子构成，向游戏板随机投掷一枚飞镖，击中阴影区域的概率是(　　) A. B. C. D. 6．如图是一张圆形纸片，小华利用它的阴影部分来制作一个圆锥的侧面，则这个圆锥的底面圆的半径是(　　) A．3.6 B．1.6 C．3 D．6 INCLUDEPICTURE"SO5.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\SO5.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\SO5.tif" \* MERGEFORMATINET (第6题)　　INCLUDEPICTURE"9SHKJ+23.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\9SHKJ+23.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\9SHKJ+23.tif" \* MERGEFORMATINET (第7题) 7.某三棱柱的三视图如图所示，已知俯视图中tan B＝，BC＝7，下列结论不正确的是(　　) A．m＝3 B．n＝2 C．tan C＝ D．S△ABC＝7 8．如图，点O是△ABC的内心，也是△DBC的外心．若∠A＝80°，则∠D的度数是(　　) A．60° B．65° C．70° D．75° INCLUDEPICTURE"9SHKJ+24.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\9SHKJ+24.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\9SHKJ+24.tif" \* MERGEFORMATINET (第8题)　　INCLUDEPICTURE"XX84.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\XX84.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\XX84.tif" \* MERGEFORMATINET (第9题) 9.如图，在△ABC中，CA＝CB，∠ACB＝90°，以AB的中点D为圆心，作圆心角为90°的扇形EDF，点C恰好在上，设∠BDF＝α(0°＜α＜90°)．当α由小到大变化时，图中阴影部分的面积(　　) A．由小变大 B．由大变小 C．不变 D．先由小变大，后由大变小 10．如图，CD是△ABC的高，若AB＝2，∠ACB＝45°，则CD的最大值为(　　) A．1＋　　 B．4－　　 C．2　　 D．4 INCLUDEPICTURE"9SHKJ+25.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\9SHKJ+25.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\9SHKJ+25.tif" \* MERGEFORMATINET (第10题)　INCLUDEPICTURE"9SHKJ+26.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\9SHKJ+26.tif" \* MERGEFORMATINET INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\\9SHKJ+26.tif" \* MERGEFORMATINET (第11题)　INCLUDEPICTURE"21秋一改+71.tif" INCLUDEPICTURE "C:\\Users\\庞建宇\\Desktop\ ... ...