关于钢化玻璃特征的说法，正确的是（）。
A.机械强度低
B.弹性差
C.热稳定性好
D.碎后易伤人
参考答案：C
His boss is _____ generous. So he gets little in reward for his hard work.[ ]
A. something of
B. nothing except
C. everything but
D. much of
下列属于照射野位置的验证方法的是（）
A.MRI
B.B超
C.DSA
D.SPET
E.EPID
