信息安全管理中，以下哪一种描述能说明“完整性"（）。 A.资产与原配置相比不发生缺失

阅读短文，从方框中选择适当的动词，并用其适当形式填空。有的需要加助动词或不定式符号 (每词限用一次)。

Mr. Jackson is sixty-four years old. He (1) ______________ in a high school in a small town. All the town people know him very well because he (2) ______________ a teacher there for over forty years.

Mr. Jackson was born in London. He was twenty-two when he (3) ______________ college. Then he came to the small town to teach. He is hard-working and always makes his lessons interesting. He likes his students and the students like him, too. He (4) ______________ as the best teacher in the school.

Mr Jackson will retire next year. But he doesn’t plan (5) ______________ back to London. “I think this small town is my hometown. I won’t leave it,” he said.

许多甲虫和蝶蛾类幼虫是虹吸式口器，能把植物咬成对缺刻、穿孔或咬断吃光。

设3阶方阵A满足A2=0，则下列等式成立的是（）．

A.A=O

B.RA.=0

C.A3=O

D.RA.=3

市净率与市盈率相比，前者通常用于考察股票的供求状况，更为短期投资者所关注；后者通常用于考察股票的内在价值，多为长期投资者所重视。( )

有机磷中毒，烟碱样症状是

A．流涎
B．多汗
C．恶心、呕吐
D．肌纤维颤动
E．肺水肿