用于血细胞比容测定用的抗凝剂要求()
A.不改变血容量
B.不改变红细胞大小
C.红细胞含量增加,抗凝剂的用量也增加
D.溶解度大
E.需提前制备抗凝管
参考答案:A, B, D, E
用所给词的适当形式填空。
1. ______ (luck), nobody was hurt.
2. Thanks for______ (invite) me to your party.
3. I ______ (bring) it here three days ago.
4. Did you have fun ______ (camp)?
5. There is a lot of______ (rain) in summer. So it's often wet.
6. The weather report says it will be ______ (wind) tomorrow.
有效的促销活动不仅可以()并激发需求,而且还可以在一定条件下()。