有一通风管道经测试管内动压(Hd)=380㎐H2O,静压(Hj)=260㎐H2O,求其全压(HQ)式多少,换算为多少Pa?
参考答案:
China's GDP grew by 7.1 percent in the first half of this year, _______ proved its proactive macro-economic policies were effective
A.it
B.that
C.what
D.which
下列哪项是反映HBV有无活动性复制和传染性的指标()
A.表面抗原(HBsAg)
B.表面抗体(抗-HBs)
C.e抗原(HBeAg)
D.e抗体(抗-HBe)
E.核心抗体(抗-HBc)