实验中常用的枸橼酸钠的抗凝机制是
A.抑制凝血酶的活性B.防止血小板激活C.中和酸性凝血因子D.螯合血浆中的Ca2+
参考答案:D
一个比例的两个外项分别是1.5和6,两个内项分别______和______.
完成下列对话。
Zoom: Hurry up. It's 6 o'clock now.
Zip: Just a minute. White 1. ? Red 2. ? Orange 3. ? Oh, yes!
I have a new 4. for my birthday party.
Zoom: What colour is it?
Zip: It's green.
Zoom: This yellow 5. is beautiful.