/end/ e_ _
举一反三
- 设`e_{1}=(1,0,... ,0),e_{2}=(0,1,... ,0),...,e_{n}=(0,0,... ,1)为n维行向量,则e_{1}+...+e_{n}`=______
- 安乐死 n. e_ _ _ _ _ _ _ _ _
- 19.语句printf("\106")执行的结果输出是E_。 ( )
- 某基元反应,在等容的条件下,当反应进度为1 mol时,吸热50 kJ,则该反应的实验活化能$E_a$值的大小范围 A: $E_{_a}\geqslant 50 \ kJ\cdot mol^{-1}$ B: $E_{_a}=- 50 \ kJ\cdot mol^{-1}$ C: $E_{_a}\leqslant 50 \ kJ\cdot mol^{-1}$ D: 无法确定
- The pressure inside the heart reaches its highest value at () A: End of atrial contraction B: End of isovolumetric contraction C: Rapid ejection phase D: End of isovolumetric relaxation E: End of ventricular filling