单纯性龈炎又称( )
A.坏死性龈炎B.龈 * * 炎C.慢性龈缘炎D.肥大性龈炎E.以上都不对
参考答案:C
Low-carbon lifestyle is of great benefit to improve the world environment._________can be
enjoyed from it until you have a deep understanding of it,however.
A.Something
B.Nothing
C.Few
D.Much
下列加密算法中,可以用于数字签名的是______。
A.DES B.3DES C.RSA D.IDEA