有关输液的质量要求不正确的是
A. 无菌、无热原
B. 澄明度应符合要求
C. 等渗或低渗
D. pH在4～9范围
E. 不得添加任何抑茵剂
控制区对空气洁净度要求是
A. 大于10万级
B. 10万级
C. 大于1万级
D. 1万级
E. 100级
Why were Sam and Joe chosen
A. The boss wanted them to get more experience.
B. The boss trusted them more than anyone else.
C. They were the last people who wanted to go.
D. They were the only men who offered to go.
According to the passage, Vienna was once a center of ______.
A. traffic
B. trade and science
C. art and music
D. and
微信支付 
支付宝支付