题型:选择题 The number of private cars in urban areas should be limited ___________the number of public buses should be increased.A.whenB.while C.unlessD.until 查看答案
题型:单项选择题 A1/A2型题 微生物对纸质病案危害中,错误的说法是()。A.分解纸张中的蛋白质使字迹模糊B.分解纸张,使纸张强度下降C.粘连纸张,危害字迹,褪色润化D.使纸张酸度增加,纸张变色、变脆E.形成霉斑,遮盖字迹,损坏纸张 查看答案