【单选题】–Hi, Danny! I can’t find my dictionary. Have you seen it __________? –Sorry, I haven’t. Why not ask Kitty? Perhaps she’s seen it.
【单选题】Hi, Jim. _________ seen you for ages. I really _______ see you here.
B.
Haven’t, didn’t expect
C.
Hadn’t, hadn’t expected
D.
Hadn’t, wasn’t expected
【单选题】在298 K,下列反应中Δ r H 与Δ r G 最接近的是 ( )
A.
CCl4 (g) + 2H2O (g) →CO2 (g) + 4HCl (g)
B.
(s) + CO2 (g) → CaCO3 (s)
C.
Cu 2+ (aq) + Zn (s) → Cu (s) + Zn 2+ (aq)
D.
2Na (s) + 2H + (aq) + 2H2O (l) → 2Na + (aq) + H2 (g) + 2OH - (aq)
【单选题】在298K,下列反应中△H-T△S与△H最接近的是( )
A.
CCl 4 (g)+2H 2 O(g)=CO 2 (g)+4HCl(g)
B.
(s)+CO 2 (g)=CaCO 3 (s)
C.
Cu 2 + (aq)+Zn(s)=Cu(s)+Zn 2 + (aq)
D.
Na(s)+H + (aq)+H 2 O(l)=Na + (aq)+H 2 (g)+OH - (aq)
【单选题】在298K标准态下,下列反应中ΔrHmθ与ΔrGmθ最接近的是:
A.
CCl 4 (l)+2H 2 O(g)=CO 2 (g)+4HCl(g)
B.
(s)+CO 2 (g)=CaCO 3 (s)
C.
Cu 2+ (aq)+Zn(s)= Cu(s)+Zn 2+ (aq)
D.
2Na(s)+2H + (aq)+2H 2 O(l)=2Na + (aq)+2OH - (aq)+H 2 (g)
【简答题】在Internet中,搜索引擎其实也是一个( )。A. A. 网站 B. C.操作系统 C. B. 域名服务器 D. D.硬件设备