肢体骨折可用()等将断骨上、下方两个关节固定,也可利用伤员身体进行固定,避免骨折部位移动,以减少疼痛,防止伤势恶化。
A.衣物
B.夹板或木棍、竹竿
C.石块
D.绷带
参考答案:B
在反应A + 3B =" 2C" + 3D中,已知2.3g A与4.8g B恰好完全反应生成4.4g C,则该反应中,B与D的质量之比为 。(2分)
As I waited for Mike to arrive, I________the clock and saw that he was late. [ ]
A. glanced at
B. stared at
C. watched
D. noticed