问题
单项选择题
内源性凝血的始动因子是（）
A.因子Ⅲ
B.第Ⅻ因子
C.血小板因子
D.钙离子
E.凝血酶原
答案
参考答案：B
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内源性凝血的始动因子是（）
A.因子Ⅲ
B.第Ⅻ因子
C.血小板因子
D.钙离子
E.凝血酶原
参考答案：B
| 根据句意，从方框内选择合适的单词填空。 | |
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| 1. We have _________ watched such an exciting football match before. 2. Lily’s grandmother has been dead _________ a few years. 3. My sister is going to Canada _________ a few days. 4. _________ you have got everything ready, please let me know. 5. —How long have you been like this? — _________ last night. |