考虑土石坝的抗震性能,地震区修建土石坝时,宜采用的筑坝材料是( )。
A.良好级配的砾砂
B.均匀的中砂
C.细砂和粉砂
D.A、B、C均可
参考答案:A
男,15岁,碎玻璃将腕部割伤1小时,查体:伸直手指,指间夹纸时无力,应考虑()
A.屈指肌腱损伤
B.骨间肌损伤
C.桡神经损伤
D.尺神经损伤
E.正中神经损伤
The teacher was a little angry because the students didn't _____ their exercise books on time. [ ]
A. hand out
B. hand to
C. hand in
D. hand on