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1、广东省深圳市宝安实验中学九年级中考数学模拟中考试题8 1. ,6的绝对值是( ) 11(A) 6 (B) ,6 (C) (D) ,662. 据深圳特区报2月28日报告，2011年底我市机动车保有量为200.8万辆，汽车保有量排名全国第二。将数据200.8万保留三个有效数字，用科学记数法表示为( ) 6267(A) 2.00810 (B) 2.0110 (C) 2.0110 (D) 0.20110 3. 下列食品商标中，即是轴对称又是中心对称图形的是( ) (A) (B) (C) (D) 4. 下列运算正确的是( ) 32632522222(A) a?a,a (B) (a),a (C) (a，b
2、)(a,b),a,b (D) (a，b),a，b 5. 根据深圳空气质量时报显示，2013年5月10日15时我市部分环境监测站“PM2.5的24小时滑动平均分指数“如下表所示: 监测站名称 盐田福田 南山 宝安 罗湖 龙岗 PM2.5 55 60 73 53 55 40 24小时滑动平均分指数 对于这组数据，下列说法中错误的是( ) (A) 平均数是56 (B) 众数是55 (C) 中位数是55 (D) 方差是7 6. 如图，在?ABC中，D、E分别是边AB、AC的中点，?B,50?，现将?ADE沿DE折叠，点A落在三角形所在的平面内的点A，则?BDA的度数为( ) 11(A) 50? (B)
3、 60? (C) 70? (D) 80? 7. 小明在白纸上任意画一个锐角，他画的角在30?到60?之间的概率是( ) 1112(A) (B) (C) (D) 36238. 下列叙述正确的个数是( ) 222?相等的角是对顶角;?长度相等的弧是等弧;?若a,b，则a,b是确定事件;?一元二次方程xx1,0有两个不相等的实数根; (A) 1个 (B) 2个 (C) 3个 (D) 4个 9. 如图是一个圆形人工湖的示意图，弦AB是湖上的一座桥，已知桥AB长100m，测得圆周角?ACB,60?，则这个人工湖的直径AD为( ) Colorimetric tube 1 0 mL glass. 4, th
4、e analysis step preparation of the sample solution: precision weighing approximately 0.01 g1.0 g sample (accurate to 0.0001 g) in 1 . V2-determination of sampling volume. Unit ml (mI. ); M-quality of the sample, expressed in grams (g); The atomic weight of 55.84-Fe; 2-conversion factors. 6, precisio
5、n under repeatability conditions to obtain the absolute value of the difference of two independent test results shall not exceed the arithmetical average of the 10%. Food additives sweet agent saccharin sodium, and sweet pigment, and acetyl sulfa acid potassium (Ann game honey, and coloring agent of
6、 test according to focus introduced anti-oxidant of detection (BHA, and BHT, and PG, and TBHQ), GB2760 GB/T5009.30, and GB/T5009.32, and GB/T5009.35, and food in the often using of anti-oxidant main has BHA, and BHT, and PG, and TBHQ tert-butyl hydroxy fennel ether (BHA) 2,6-II tert-butyl on cresol
7、(BHT ) Of tert-butyl hydroxy anisole (BHA) 2,6-di-tert-butyl-p-cresol (BHT) testing in accordance with GB/T5009.30 vapor phase chromatography and thin-layer chromatography, this section focuses on Colorimetry. Principle 1, obtained by steam distillation of the sample. separate the BHT, methanol abso
8、rption, o-anisidine and sodium nitrite solution orange-red, extracted with chloroform, compared with standard sizing. 2, anhydrous calcium chloride reagent. Methanol. Chloroform. Methanol (50%). Sodium nitrite solution (3 g/l): keep in dark place. O-anisidine solution; weighing 125 mg o-anisidine in
9、 50mL the second Brown volumetric flask, add 25mL methanol and shake to dissolve, and 50mg activated carbon, shake10032003(A) (B) (C) (D) 150m 1003mmm33210. 已知二次函数y,ax，bx，c(a?0)的图象如图所示，现有下列结论:?abc0;?b2,4ac0;?4a,2b，c0;?b,4ac0;?4a,2b，c0 抛物线与x轴有2个交点；（2）圆是轴对称图形，直径所在的直线是它的对称轴，圆有无数条对称轴。圆是中心对称图形，对称中心为圆心。(第
10、12题) (第15题) (第16题) tanA没有单位，它表示一个比值，即直角三角形中A的对边与邻边的比；Colorimetric tube 1 0 mL glass. 4, the analysis step preparation of the sample solution: precision weighing approximately 0.01 g1.0 g sample (accurate to 0.0001 g) in 1 . V2-determination of sampling volume. Unit ml (mI. ); M-quality of the sample
11、, expressed in grams (g); The atomic weight of 55.84-Fe; 2-conversion factors. 6, precision under repeatability conditions to obtain the absolute value of the difference of two independent test results shall not exceed the arithmetical average of the 10%. Food additives sweet agent saccharin sodium,
12、 and sweet pigment, and acetyl sulfa acid potassium (Ann game honey, and coloring agent of test according to focus introduced anti-oxidant of detection (BHA, and BHT, and PG, and TBHQ), GB2760 GB/T5009.30, and GB/T5009.32, and GB/T5009.35, and food in the often using of anti-oxidant main has BHA, an
13、d BHT, and PG, and TBHQ tert-butyl hydroxy fennel ether (BHA) 2,6-II tert-butyl on cresol (BHT ) Of tert-butyl hydroxy anisole (BHA) 2,6-di-tert-butyl-p-cresol (BHT) testing in accordance with GB/T5009.30 vapor phase chromatography and thin-layer chromatography, this section focuses on Colorimetry.
14、Principle 1, obtained by steam distillation of the sample. separate the BHT, methanol absorption, o-anisidine and sodium nitrite solution orange-red, extracted with chloroform, compared with standard sizing. 2, anhydrous calcium chloride reagent. Methanol. Chloroform. Methanol (50%). Sodium nitrite solution (3 g/l): keep in dark place. O-anisidine solution; weighing 125 mg o-anisidine in 50mL the second Brown volumetric flask, add 25mL methanol and shake to dissolve, and 50mg activated carbon, shake