下列属于深反射的是（）。
A.膝反射
B.腹壁反射
C.提睾反射
D.角膜反射
参考答案：A
They won't let him out of the hospital ________ he's completely recovered.
A．since
B．until
C．if
D．as
图27-5所示为Cu-Ag-Cd三元合金系的液相面投影。
