下列结石中，不能被平片显影的是
A．尿酸结石
B．草酸钙结石
C．磷酸盐结石
D．碳酸盐结石
E．胱氨酸结石
参考答案：A,E
.
It seems to me that______little money he earns hardly supports______family as large as hi:
A．the;a B．a；the c．不填；a D．不填：the
点荷法制备试件时，加工或选取的砂浆试件厚度应符合（）
A.5mm～12mm
B.0.5mm～1.2mm
C.5cm～12cm
D.10mm～15mm
