题目

某同学用按实验规定的用量量取15mL液体时俯视量筒，则该同学实际量取的体积（ ）A.等于15mL B.大于15mL C.小于15mL D.无法确定 答案：【答案】C【解析】用量取液体体积时，量筒要放平，读数时视线应与量筒内液体的凹液面最低处相平；如果仰视液面，读数比实际偏小，若俯视液面，读数比实际偏大；所以俯视量筒，实际量取的体积小于15mL。故选C。In that school, German is compulsory for all students, but English and French are_______.A．specialB．regionalC．optionalD．original