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【简答题】
Replace the underlined part in each of the following sentences with a word or phrase from the box below. Write your answer in the brackets. Change the form where necessary. in use overall consist of haul toss go out 1.All electronic computers are made up o f four basic units although they may be of different kinds. ( ) 2.The moment I saw it clearly for what it was — a dead fish — I threw it away immediately. ( ) 3.True, the furnishings are dated (陈旧的) but in general, the hotel is very clean and the staff very friendly. ( ) 4.They had little difficulty in hooking the fish, but pulling it out of the water proved to be a big problem. ( ) 5.They built a fireplace to heat the small flat, but there were nights when the fire stopped burning and they shivered under the blanket. ( ) 6.The pot you saw had been in service for four years and showed very little wear (磨损,用旧). ( )
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【单选题】检查中草药中是否有羟基蒽醌类成分, 常用哪类试剂
A.
无色亚甲蓝
B.
5%盐酸水溶液
C.
5%NaOH水溶液
D.
甲醛
E.
HCl-Mg粉
【单选题】检查中草药中是否有羟基蒽醌类成分,常用试剂是
A.
0.5%醋酸镁
B.
5%盐酸水溶液
C.
5%NaOH水溶液
D.
对亚硝基二甲苯胺
E.
对二甲氨基苯甲醛
【单选题】在对n个元素进行冒泡排序的过程中,第一趟排序至多需要进行()对相邻元素之间的交换。
A.
n/2
B.
n-1
C.
n
D.
n+1
【单选题】检查中草药中是否有羟基蒽醌类成分,常用( )试剂
A.
无色亚甲蓝
B.
5%盐酸水溶液
C.
5%NaOH水溶液
D.
甲醛
E.
活性次甲基试剂
【单选题】检查中草药中是否有羟基蒽醌类成分,常用试剂是( )
A.
5% 醋酸镁
B.
5% 盐酸水溶液
C.
5%NaOH 水溶液
D.
对亚硝基二甲苯胺
E.
对二甲氨基苯甲醛
【单选题】对于桥式整流电路,若整流变压器副边电压的有效值为 U 2 ,则整流后所得电压的平均值为 ( ) 。
A.
1.414U 2
B.
U 2
C.
0.9 U 2
D.
0.45 U 2
【单选题】检查中草药中是否有羟基蒽醌类成分,常用试剂是:
A.
无色亚甲蓝
B.
5%盐酸水溶液
C.
5% NaOH水溶液
D.
甲醛
【单选题】在对n个元素进行冒泡排序的过程中,第一趟排序至多需要进行()次相邻元素之间的交换。
A.
n
B.
n-1
C.
n+1
D.
n/2
【多选题】若变压器副边电压有效值为10V,对于单相桥式整流电路,则有:
A.
整流输出电压的平均值为12V
B.
整流输出电压的平均值为9V
C.
整流管上所承受的最大反向峰值电压约为14.1V
D.
整流管上所承受的最大反向峰值电压约为10V
【单选题】检查中草药中是否有羟基蒽醌类成分,常用试剂。
A.
无色亚甲蓝
B.
5%盐酸水溶液
C.
5%NaOH水溶液
D.
甲醛
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