Do what you have been told, ____ you will be punished.
A. and
B. but
C. or
D. after all
查看答案
Take an umbrella ______ it rains.
A. in case
B. in any case
C. because
D. for
血液凝固发生的原因是
A. 红细胞叠连
B. 血细胞凝聚
C. 纤维蛋白形成
D. 红细胞破裂
能使血液粘度降低的因素是
A. 硬膜外麻醉
B. 吸入麻醉
C. 长期吸入纯氧
D. 急性感染