火焰发飘的原因是一次风门开度过小。
参考答案:对
某患者血清检测HBsAg(十)、HBeAg(十)则说明该患者()
A.无传染性
B.正向好的方向转
C.曾经感染过乙型肝炎病
D.对HBV具有免疫力
E.具有较强的传染性
Which of the following statements is true of dyslexia
A.It is a worldwide problem.
B.It is a regional problem.
C.It is a social problem.
D.It is a biological problem.