Which of the following is not a greenhouse gas ( ).
A: H2O
B: CO2
C: NO2
D: N2
A: H2O
B: CO2
C: NO2
D: N2
举一反三
- Which of the following options is not greenhouse gas? A: CO2; B: N2; C: CH4; D: N2
- 气调保鲜常用的气体主要是()。 A: N<sub>2</sub>,H<sub>2</sub>,O<sub>2</sub> B: N<sub>2</sub>,CO<sub>2</sub>,O<sub>2</sub> C: H<sub>2</sub>,O<sub>2</sub>,CO<sub>2</sub> D: CO<sub>2</sub>,H<sub>2</sub>,N<sub>2</sub>
- *下列 反应的 △ r H m θ (298K) 就是 △ f H m θ (CO 2 , g,298K) 。 (A) CO(g)+1/2O 2 (g)=CO 2 (g) (B) C( 金刚石 )+O 2 (g)=CO 2 (g) (C) C( 石墨 )+O 2 (g)=CO 2 (g) (D) CO 2 (g) = C( 石墨 )+O 2 (g)
- 微需氧菌培养时,气体环境为() A: 5%H<sub>2</sub>、85%N<sub>2</sub>、10%CO<sub>2</sub> B: 10%H<sub>2</sub>、85%N<sub>2</sub>、5%CO<sub>2</sub> C: 85%O<sub>2</sub>、5%N<sub>2</sub>、10%CO<sub>2</sub> D: 5%H<sub>2</sub>、85%N<sub>2</sub>、10%CO<sub>2</sub> E: 5%O<sub>2</sub>、85%N<sub>2</sub>、10%CO<sub>2</sub>
- Which one of the following is an example for exponential time complexity? A: O(2<sup>n</sup>) B: O(1) C: O(n) D: O(n<sup>2</sup>)