A: C
B: C
C: CH
D:
E:
F: H
G:
H: C
I: CH
J: C
K: C
L: H
M: C
N:
O: H
举一反三
- 咖啡因的结构如下图，其结构中R1、R3、R7分别为 A: H、CH 3、CH 3 B: CH 3、CH 3、CH 3 C: CH 3、CH 3、H D: H、H、H
- It should be noted that many people feel their life is both happy and meaningful. A: A B: B C: C D: D E: E F: F G: G H: H I: I J: J K: K L: L M: M N: N O: O P: P Q: Q R: R
- Most books on happiness today assert that happiness is beneficial to health. A: A B: B C: C D: D E: E F: F G: G H: H I: I J: J K: K L: L M: M N: N O: O P: P Q: Q R: R
- Evidence from research shows that it takes meaning for people to thrive. A: A B: B C: C D: D E: E F: F G: G H: H I: I J: J K: K L: L M: M N: N O: O P: P Q: Q R: R
- 下列反应中，哪个是表示ΔH=ΔHfA、gB、r（s）的反应？（） A: B: g（ C: q）+ D: r（ E: q）= F: g G: r（s） H: 2 I: g（s）+ J: r2=2 K: g L: r（s） M: N: g（s）+1/2 O: r2（l）= P: g Q: r（s） R: S: g（s）+1/2 T: r2（S）= U: g V: r（s）
内容
- 0
Agriculture proves very difficult to quantify because of the constantly changing conditions involved. A: A B: B C: C D: D E: E F: F G: G H: H I: I J: J K: K L: L M: M N: N O: O P: P Q: Q R: R
- 1
Experiments were carried out to determine our body's genetic expression of feelings of happiness and meaning. A: A B: B C: C D: D E: E F: F G: G H: H I: I J: J K: K L: L M: M N: N O: O P: P Q: Q R: R
- 2
【单选题】由下列数据确定CH 4 (g)的为Δ f H m Θ 为 () C ( 石墨 ) +O 2 (g)=CO 2 (g) Δ r H m Θ =-393.5kJ·mol - 1 H 2 (g)+1/2O 2 (g)=H 2 O(l) Δ r H m Θ =-285.8kJ·mol - 1 CH 4 (g)+2O 2 (g)=CO 2 (g)+2H 2 O ( l ) Δ r H m Θ =-890.3kJ·mol - 1 A. 211 kJ·mol -1 B. -74.8kJ·mol - 1 C. 890.3 kJ·mol - 1 D. 缺条件，无法算
- 3
咖啡因的结构如下图,其结构中R,、R,、R,分别为() A: H、CH3、CH3 B: CH3、CH3、CH3 C: CH3、CH3、H D: H、H、H E: CH2OH、CH3、CH3
- 4
以下选项_____不是下图的宽度优先遍历序列。[img=1398x805]180308a9a445f86.png[/img] A: A,B,D,C,E,K,F,J,H,I,G,O,L,M,N B: A,B,D,C,E,K,F,J,G,H,I,M,L,N,O C: A,B,D,C,E,K,F,J,G,H,I,L,M,N,O D: A,D,B,C,E,K,F,J,G,H,I,M,L,N,O