Which of the following countries aced in the optimum use of gunpowder?

哺乳动物的细胞程序性死亡与下列哪一基因有关？（） A: Aced-3 B: Bbcl-2 C: Chunchback D: Ddorsal

根的中柱鞘细胞具有潜在的分生能力可产生（）。A.侧根B. 部分形成层C.木栓形成层D.不定芽E.皮层 A: ABCD B: BACD C: ACED D: ABC

下列括号内英文缩写正确的是 A: 肾素-血管紧张素系统(RB B: 血管紧张素转换酶抑制药(ACED C: 血管紧张素Ⅱ(CARⅡ) D: 血管紧张素转换酶(A E: 钙离子拮抗药(CD

Which of the following statements is NOT an understatement? A: It isn’t very serious. I have this tiny little tumor on the brain. B: Maya was somewhat pleased when she aced the calculus final. C: Sally was a tad annoyed when her brother sneaked a peak at her secret diary. D: Every word Laurie says is a lie, including “a” and “the”.

函数的定义域是/ananas/latex/p/1132315: (-∞, -3)∪(-3, +∞)|(-∞, -3)∪(-3, 3)∪(3, +∞)|(-∞, -3)∪(3, +∞)|(-∞, 3)∪(3, +∞)

智慧职教: 按自然数的乘法按定义计算3×5. 解   由定义5知3x5=(3x4) 3 =[(3x3) 3] 3 ={[(3x2) 3] 3} 3 ={{[(3x1) 3] 3} 3} 3 ={{[(3 3) 3] 3} 3} ={[(6 3) 3] 3} =(9 3) 3 =12 3=15 上述计算是（   ）的

3√3—/3√3/

下列各项中，哪一项不是Kirsch边缘检测中构建的模板（） A: [5 5 5；-3 0 -3；-3 -3 -3] B: [-3 5 5；-3 0 5；-3 -3 -3] C: [5 5 5；-3 -3 0；-3 -3 -3] D: [-3 -3 -3；-3 0 -3；5 5 5]

3⊥3与3┬3舌轴嵴形态的区别是（） A: 舌轴嵴3┬3与3┬3同样明显 B: 舌轴嵴3┬3不如3⊥3明显 C: 舌轴嵴3┬3比3⊥3明显 D: 舌轴嵴3┬3与3⊥3均不明显