Inclusion criteria were(入选标准是) randomization of patients with acute coronary syndromes but without persistent ST elevation.

In designing an experiment, blocking is used A: to reduce variation B: to control the level of the experiment C: as a first step in randomization D: None of the above

For known but uncontrollable nuisance factors, which of the following method can we use for processing and analysis. A: Randomization B: Covariance analysis C: Block design D: None

（2-2）下列Windows机制中不是针对缓冲区溢出的技术为：（ ） A: GS编译技术 B: E.H C: ASLR（Address space layout randomization） D: DEP

当改变明文中的某一位时，密文中的多处会随之改变，这一特性是（）。 A: 随机Randomization B: 扩散Diffusion C: 排列Permutation D: 离散Discrete

当改变明文中的某一位时，密文中的多处会随之改变，这一特性是（）。 A: A随机Randomization B: B扩散Diffusion C: C排列Permutation D: D离散Discrete