【单选题】What's the first name of the man they are talking about?
【单选题】What made it possible for Tim to see the entry to the cave?
A.
The height of the first rocks.
B.
The ups and downs of the waves.
C.
The change in the position of the sun.
D.
The vast stretch of the sunlit beach.
【单选题】What is the problem with Tim’s first choices?
A.
The first ideas he presents are too narrow.
B.
Tim has not fleshed them out enough.
C.
These ideas are not really original.
D.
His ideas are too broad.
【单选题】当空气的相对湿度为98%时,空气的干球温度t、湿球温度tw、露点温度td三者的关系为()
【单选题】下列有关说法正确的是
A.
Hg(l) + H 2 SO 4 (aq) = HgSO 4 (aq) + H 2 (g)常温下不能自发进行,说明△H<0
B.
用惰性电极电解1L1mol/L的CuSO 4 溶液,当阴极析出3.2 g铜时,加入0.05 molCu(OH) 2 固体可将溶液恢复至原浓度
C.
已知25℃时,Ksp(AgCl)=1.8×10 -10 、Ksp(Ag 2 CrO 4 )=2.0×10 -12 ,所以AgCl的溶解度大于Ag 2 CrO 4 的溶解度
D.
25℃时,向0.1 mol/L CH 3 COOH溶液中加入少量CH 3 COONa固体,该溶液中水的电离程度将增大,且Kw不变
【单选题】At first, Tim grew tomatoes ____________.
A.
to sell at the Farmers' Market
B.
To eat in his apartment
【单选题】下列说法正确的是
A.
反应2Mg+CO 2 2MgO+C Δ H <0从熵变角度看,可以自发进行
B.
在密闭容器发生可逆反应:2NO(g)+2CO(g) N 2 (g)+2CO 2 (g) Δ H =-113.0 kJ/mol,达到平衡后,保持温度不变,缩小容器体积,重新达到平衡后,Δ H 变小
C.
已知: K sp (AgCl)=1.8×10 - 10 , K sp (Ag 2 CrO 4 )=2.0×10 - 12 ,将等体积的浓度为1.0×10 - 4 mol/L的AgNO 3 溶液滴入到浓度均为1.0×10 - 4 mol/L的KCl和K 2 CrO 4 的混合溶液中产生两种不同沉淀,且Ag 2 CrO 4 沉淀先产生
D.
根据HClO的 K a =3.0×10 - 8 ,H 2 CO 3 的 K a 1 =4.3×10 - 7 , Ka 2 =5.6×10 - 11 ,可推测相同状况下,等浓度的NaClO与Na 2 CO 3 溶液中,pH前者小于后者