问题
单项选择题
关于凝血因子，正确的是（）
A.用罗马字命名的凝血因子共13种
B.所有凝血因子均存在于血液中
C.大多数凝血因子以维生素K为原料，在肝脏合成
D.所有凝血因子均具有酶的活性
E.贮存不稳定的凝血因子为V、Ⅶ和Ⅷ
答案
参考答案：E
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关于凝血因子，正确的是（）
A.用罗马字命名的凝血因子共13种
B.所有凝血因子均存在于血液中
C.大多数凝血因子以维生素K为原料，在肝脏合成
D.所有凝血因子均具有酶的活性
E.贮存不稳定的凝血因子为V、Ⅶ和Ⅷ
参考答案：E
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| Today is Sunday. ① warm and sunny. Tom and ② classmates ③ no class today. They are going to ④ the zoo. They are going to ⑤ at the bus stop at 10 ⑥ . Tom and his classmates are going to look ⑦ the monkeys, tigers and bears there. Tom's sister ⑧ him there is a new elephant in the ⑨ . Tom wants ⑩ the elephant very much. Tom will get home at about 5 o'clock. |
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