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【简答题】
Professor Green, known to the world as a scientist, is not only absent-minded but short-sighted as well. His mind is always busy scientific problems and seldom notices what is going on him. One fine day recently, he went a walk in the countryside, but as he has a book in his hand. When he went out , he began to read his book . He hadn’t gone far he run into a big cow and fell down. In the fall, he had lost his glasses, without which he couldn’t see anything. He thought he had hit his head a fat lady. “I’m sorry, Madam.” He said politely searching for his glasses. As soon as he had , he realized his mistake. Soon he was fixing his mind on his book and paid no attention to anything else. He had scarcely been walking for five minutes when he fell over again, both his book and his glasses. This time he got very angry, seizing his umbrella, he gave the “cow” a wild blow. Then, after finding his glasses, he realized with horror that he made a second mistake. A large fat woman was fleeing from him in a horror. 小题1: A.to think B.thinking C.thinking about D.to think of 小题2: A.with B.around C.for D.at 小题3: A.for B.to C.towards D.over 小题4: A.also B.often C.ever D.usual 小题5: A.when B.while C.just then D.at that time 小题6: A.to B.against C.about D.onto 小题7: A.after B.in C.before D.during 小题8: A.put it on B.taken them off C.put them on D.taken them out 小题9: A.always B.again C.usually D.very much 小题10: A.holding B.getting C.finding D.losing
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【简答题】计算下列物质水溶液的 pH 值。 (1) 0.10mol/L 乙酸溶液, pH= (K a =1.8×10 -5 ) (2) 0.20mol/L 氨水 (NH 3 ·H 2 O) , pH= (K b =1.8×10 -5 )
【单选题】氨水 ( K b =1.8×10 -5 ) 溶液中 [ OH - ] =2.4×10 -3 mol·L -1 ,则氨水的浓度为( mol·L -1 ) :
A.
0.32
B.
0.18
C.
3.2
D.
1.8
【多选题】以下说法正确的是;()
A.
1543年维萨留斯的伟大著作——《论人体构造》出版
B.
盖伦在解剖实验中发现哈维的动脉吸收理论是错误的
C.
哈维把自己的毕生心血著成《心血运动论》
D.
塞尔苏斯将盖伦的体系完整地构建成独立的科学体系
【单选题】将 0.20 mol·L -1 的氨水与 0.20 mol·L -1 的 HCl 等体积混合后,溶液的 pH 为 ( ) 已知氨水的 K b =1.8×10 -5
A.
2.72
B.
2.87
C.
4.98
D.
5.13
【单选题】在动力监控系统中,以下( )不属于模拟量
A.
温度
B.
门禁
C.
电压
D.
电流
【判断题】为了保证数据一致性,数据库管理系统不允许多个用户同时访问相同数据。
A.
正确
B.
错误
【单选题】1543年维萨留斯的伟大著作()出版,在书中他论述了骨骼系统、肌肉系统、血液系统等七大系统。
A.
《论人体构造》
B.
《解剖学》
C.
《骨骼解剖》
D.
《人体解剖》
【单选题】已知在一定温度下,氨水的K=1.8×10-5,其浓度为0.500mo1/L时溶液的pH为()
A.
2.52
B.
11.48
C.
9.23
D.
12.47
【简答题】某HAc(K a =1.8×10 -5 )溶液其解离度为2.0%,某氨水(K b =1.8×10 -5 )其OH - 、浓度为1.5×10 -3 mol·L -1 。试求:
【单选题】已知氨水的KΘb=1.8×10-5,其共轭酸的KΘa为( )。
A.
1.8×10-9
B.
5.6×10-10
C.
5.6×10-8
D.
1.8×10-10
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