味精生产中无菌压缩空气的作用是什么?
参考答案:
①提供氧气
②输送物料
---Do you know if Helen is willing to take charge of the project?
--- , does it?
A.It takes no time
B.It counts for nothing
C.It doesn’t hurt to ask
D.It doesn’t make sense
患者,男,28岁,自感低热,乏力,食欲减退,有盗汗,体重下降,呼吸困难,胸痛等表现,就医诊断为浸润型肺结核,收入院抗结核治疗。
血吸虫病的传播途径是()
A.粪·口传播
B.血液传播
C.飞沫传播
D.直接接触传播
E.间接接触传播