口腔黏膜中蛋白质合成最活跃的是
A．角化层
B．基底层
C．棘细胞层
D．粒层
E．颗粒层
参考答案：C
He accidentally _____ he had quarreled with his wife and that he hadn’t been home for a couple of weeks.
A．worked out
B．made sure
C．led to
D．let out
在轴套的维修保养中，测定轴套的外圆磨制情况，一般不得超过原直径的（）。
A、2%
B、2.5%
C、3%
D、3.5%
