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【单选题】
下列关于热化学反应的描述中正确的是
A.
已知H + (aq) + OH - (aq) = H 2 O(l)D H =-57.3kJ·mol - 1 ,则H 2 SO 4 和Ba(OH) 2 反应的反应热D H =-114.6kJ·mol - 1
B.
密闭容器中,9.6 g硫粉与11.2 g铁粉混合加热生成硫化亚铁17.6 g时,放出19.12 kJ热量,则Fe(s)+S(s)=FeS(s)DH=' +95.6' kJ·mol -1
C.
常温时H 2 (g)的燃烧热是285.8 kJ·mol - 1 ,则2H 2 O(g)=2H 2 (g)+O 2 (g) D H =+571.6 kJ·mol - 1
D.
常温时葡萄糖的燃烧热是2800 kJ·mol - 1 ,则1/2C 6 H 12 O 6 (s)+3O 2 (g)=3CO 2 (g)+3H 2 O( l ) D H =-1400 kJ·mol - 1
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举一反三
【简答题】有逗号表达式 (a=3*5,a*4) ,则 a 的值为 ________ 。
【判断题】社会主义初级阶段,由于种种原因,阶级矛盾和阶级斗争仍将在一定范围长期存在,在某种条件下还有可能激化。( )
A.
正确
B.
错误
【单选题】In the first paragraph,the writer mentioned Michael Phelps ________.
A.
to introduce a doctor of TCM
B.
to give an example of using cupping
C.
to introduce the Rio Olympics
D.
to give an example of a good swimmer
【简答题】阅读理解。 Michael Phelps and his U.S. teammates crowned the greatest single Olympic performance on 17th August, 2008 with a win in the 4?100 - meter medley relay. The victory gave Phelps his eighth gold m...
【单选题】—Do you know how many gold medals the 23-year-old Michael Phelps _______ at the 2008 Summer Olympic Games? —Eight. [     ]
A.
win
B.
wins
C.
won
D.
has won
【单选题】The native Canadians lived in ________with nature, for they respected nature as provider of life.
A.
coordination
B.
acquaintance
C.
contact
D.
harmony
【判断题】Scabby Bill is one of the invisible black native who lived in the settlement.
A.
正确
B.
错误
【单选题】逗号表达式(a=3*5,a*4),则a+15的值为,a的值为
A.
15,60
B.
60,30
C.
30,15
D.
不确定,90
【单选题】设逗号表达式(a=3*5,a*4),则a+15的值和a的值为
A.
15,60
B.
60,30
C.
30,15
D.
不确定,90
【单选题】在三相正弦交流电路中,下列四种结论中,正确的答案应是( )
A.
三相负载作星形联接时,必定有中线
B.
三相负载作三角形联接时,其线电流不一定是相电流的3倍
C.
三相三线制星形联接时,电源线电压必定等于负载相电压的3倍
D.
三相对称电路的总功率,P=3U p I p cosφ
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