在正常静息状态下,每循环100ml血液由周围组织向肺部输送多少毫升CO2是()
A.3ml
B.4ml
C.10ml
D.35ml
E.40ml
参考答案:B
____________ to tell him the news; he has been told of it.
A.There is no need
B.It is no need
C.You are no need
D.It needn’t
注水工艺包括打钻孔、()及注水三道工序。