圆的面积计算 判断圆中的线段是不是半径（The area of the circle is calculated to determine whether the line segment in the circle is a radius）.doc

圆的面积计算 判断圆中的线段是不是半径（The area of the circle is calculated to determine whether the line segment in the circle is a radius） Data worth having From the usual study, accumulation and summary Where there is a problem, there must be some Please also criticize and correct me! Penghu county junior high school to clear 96 school year second semester first examination of natural science and life technology examination 8 years ___ class number: ___ Name: __________ First, select: 86% (2 points per subject) 1. () electrolyte is because which of the following particles moves in aqueous solution and conducts electricity? (A) electron (B), proton (C) ion (D) molecule (2.) the concentrated sulfuric acid drops in on sugar Sugar into carbon black Because what is the nature of concentrated sulfuric acid? (A) acid strong (B), corrosive (C), dehydrated (D), high boiling point 3. () aqueous solution of calcium chloride What is the total quantity of chloride ion and calcium ion? (A) 1:2 (B), 2:1 (C), 1:1 (D), 1:3 4. () the aqueous solution of the following options What is acidic solution? (A) NaOH (B), HCl (C), Ca (OH) 2 (D), NH3 5. () mother fired a plate of purple Korea food The juice was just beginning to purple Later, because the ginseng mixed with vinegar The color turns pink After eating, rinse the plates with soapy water The juice has turned yellow again What kind of solution would you add to the purple Korea vegetable juice? Will the color turn yellow? (A) sodium bicarbonate (B), lemon juice (C), rice wine (D), salt 6. () about electrolyte Which of the following is true? (A) copper wires can conduct electricity Therefore, copper is an electrolyte (B), and salt in solids does not conduct electricity So salt is not electrolyte (C), alcohol is soluble in water So it is electrolyte (D), hydrochloric acid is an aqueous solution of hydrogen chloride Conductive Electrolyte 7. () a drunk driving a violation drink 2000mL alcohol concentration of 4.5% of the spleen wine The police tested th