喷混凝土过程中应注意检查什么?
参考答案:喷射过程中应及时检查喷射厚度,混凝土的回弹率及实际配合比。
We are confident that the environmenr by our further efforts to reduce pollution
A.had been improved
B.will be imroved
C.is improved
D.was improved
下列哪些对脑循环有调节作用的是()
A.PaC02
B.Pa02
C.代谢性因素
D.神经性因素
E.麻醉因素