学校与书店相距120米,每隔50米立一根电线杆,中间需要立多少根电线杆?正确列式是[ ]
A.120÷50
B.120÷50+1
C.120÷(50 -1)
D.120÷50-1
答案:D
After so long a walk, he was too _____ further.
A.tired for walk
B.tire to walk
C.tiring to go
D.tired to go
下列有关注射时针头斜面与皮肤所成角度正确的是()
A.皮内注射5°
B.皮下注射30°~40°
C.臀中肌、臀小肌注射90°
D.头静脉注射20°~25°
E.股静脉注射45°或90°