Mike is better than Peter _______swimming. A.for B.at C.on D.in
Mike is better than Peter _______swimming. A.for B.at C.on D.in
Do you agree____ this plan (arrangement)? A: A.at B: B.with C: C.on D: D.to
Do you agree____ this plan (arrangement)? A: A.at B: B.with C: C.on D: D.to
—What is China famous ________? —The Great Wall. A: A.for B: B.at C: C.on D: D.in
—What is China famous ________? —The Great Wall. A: A.for B: B.at C: C.on D: D.in
"Do you like your boss" No, he is too______." A: in demand B: B.demanded C: C.on demand D: D.demanding
"Do you like your boss" No, he is too______." A: in demand B: B.demanded C: C.on demand D: D.demanding
63.—John won’t join the chess club,will he? —No. He has no interest_________ playing chess. A: A.at B: B.in C: C.on
63.—John won’t join the chess club,will he? —No. He has no interest_________ playing chess. A: A.at B: B.in C: C.on
8. We would like to enter _______ business relationship with your company and wait for your early reply. A: A.at B: B.into C: C.on D: D.onto
8. We would like to enter _______ business relationship with your company and wait for your early reply. A: A.at B: B.into C: C.on D: D.onto
比较C≡C, C=C, C─C, C=C─C=C的键长次序为: C=C─C=C>C─C> C≡C >C=C|C=C─C=C>C─C>C=C>C≡C|C≡C>C=C>C─C>C=C─C=C|C─C>C=C>C=C─C=C>C≡C|C─C>C=C─C=C>C=C>C≡C
比较C≡C, C=C, C─C, C=C─C=C的键长次序为: C=C─C=C>C─C> C≡C >C=C|C=C─C=C>C─C>C=C>C≡C|C≡C>C=C>C─C>C=C─C=C|C─C>C=C>C=C─C=C>C≡C|C─C>C=C─C=C>C=C>C≡C
下列哪种主链骨架原子排列最能代表两个肽键?() A: Cα—N—Cα—C—Cα—N—Cα—C B: Cα—N—C—C—N—Cα C: C—N—Cα—Cα—C—N D: Cα—C—N—Cα—C—N E: Cα—Cα—C—N—Cα—Cα—C
下列哪种主链骨架原子排列最能代表两个肽键?() A: Cα—N—Cα—C—Cα—N—Cα—C B: Cα—N—C—C—N—Cα C: C—N—Cα—Cα—C—N D: Cα—C—N—Cα—C—N E: Cα—Cα—C—N—Cα—Cα—C
比较C≡C(Ⅰ),C=C(Ⅱ),C─C(Ⅲ),C=C─C=C(Ⅳ)的键长次序为( )。 A: Ⅰ>Ⅱ>Ⅲ>Ⅳ B: Ⅲ>Ⅱ>Ⅳ>Ⅰ C: Ⅲ>Ⅳ>Ⅱ>Ⅰ D: Ⅳ>Ⅲ>Ⅱ>Ⅰ
比较C≡C(Ⅰ),C=C(Ⅱ),C─C(Ⅲ),C=C─C=C(Ⅳ)的键长次序为( )。 A: Ⅰ>Ⅱ>Ⅲ>Ⅳ B: Ⅲ>Ⅱ>Ⅳ>Ⅰ C: Ⅲ>Ⅳ>Ⅱ>Ⅰ D: Ⅳ>Ⅲ>Ⅱ>Ⅰ
不稳定的一类化合物是: C≡C|C-C|C=C|C=C-C=C|C=C=C
不稳定的一类化合物是: C≡C|C-C|C=C|C=C-C=C|C=C=C