营养不良性大疱性表皮松解症的水疱位于()。
A.真皮内
B.透明板内
C.致密板下层
D.角质层内
E.颗粒层
参考答案:C
The students together with the head teacher _________ visit the Chime Long Paradise.
A.is going to
B.are going to
C.is to be
D.may going to
调压器调节指挥器和排气阀的调节弹簧呈自由状态,打开进气阀后,调压器呈开启状态。