凝血过程中参与很多化学反应的物质是()
A.Ca2+
B.抗凝血因子Ⅲ
C.血小板因子Ⅲ
D.因子Ⅻ
E.因子Ⅲ
参考答案:A
The police found that the house____and a lot of things___. [ ]
A. has broken into; has been stolen
B. had broken into; had been stolen
C. has been broken into; stolen
D. had been broken into; stolen
在光滑的冰面上开车是不容易的,可是我在北极见到的芬兰司机,在冰道上开车的时速和在柏油路上一样快。为了保障安全,这里的汽车都备有两套轮子,一套是夏季用的普通轮子,一套是适用于冰面的带针的轮子,公路上的另一奇景是白天行驶的车辆都开着灯,据说这样事故发生率比较低。最合适做本段文字标题的是( )。
A.北极见闻
B.北极气温
C.行车规则
D.行车怪异