To prevent viruses from spreading, we should______________
A. shake hands with our friends instead of kissing them
B. never touch the telephones, towels or plates
C. often wash our hands
D. often rub our noses and eyes
第6題
在縱向坡度為6‰的坡段上兩點,兩點之間水平距離為2000m,那么兩點之間高差為()。
A.12000mm
B.1200mm
C.120mm
D.12mm
第7題
A、B兩點間的水平距離D=100m,高差hAB=2m,則坡度iAB=2﹪iBA=2﹪。()
為了保護您的賬號安全,請在“上學吧”公眾號進行驗證,點擊“官網服務”-“賬號驗證”后輸入驗證碼“”完成驗證,驗證成功后方可繼續查看答案!