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【单选题】
执行下列语句后,变量 a 中的值是多少呢? a=0x02; a<<=1;A.
0x02
B.
0x04
C.
0x08
D.
0x0a
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举一反三
【简答题】A sample solution may contain any or all of the following ions: and . No precipitate formed when an aqueous solution of sodium chloride or sodium sulfate was added to the sample solution. A precipitat...
【单选题】Categories of U.S. consumer spending, ranked from largest to smallest, are
A.
housing, food & beverages, education & communication, and transportation.
B.
education & communication, housing, food & beverages, and transportation.
C.
food & beverages, housing, transportation, and medical care.
D.
housing, transportation, food & beverages, and medical care.
【单选题】The formation of a white precipitate when adding a solution of silver nitrate to a dissolved sample indicates the presence of ( ).
A.
nitrate
B.
sulfide
C.
chloride
D.
Sulfate
【判断题】30旅游突发事件是指突然发生、造成或者可能造成旅游者人身伤亡、财产损失, 需要采取应急处置措施予以应对的自然灾害、事故灾难、公共卫生事件和社会安 全事件
A.
正确
B.
错误
【单选题】A 2.0 mL sample of a colorless solution, when treated with a few drops of 2 M hydrochloric acid, forms a white precipitate which dissolves when the solution is heated to boiling. The original solution...
A.
I only
B.
II only
C.
Either I or II
D.
Neither I nor II
【单选题】方便面是一种只用开水一冲就能食用的快餐食品,它以不需烹调并且味道鲜美可 口而深受消费者欢迎。正是这一创新,使发明方便面的日本一家小企业一跃成为食品行业的明星。许多企业触类旁通,沿着这一思路,开发出以“方便”为特点的方 便米饭、方便米粉、方便蔬菜、方便啤酒、方便饮料等新食品。请问这种创新运用了哪种扩散思维?( )
A.
思路扩散
B.
原理扩散
C.
技术扩散
D.
功能扩散
【单选题】Which of the following categories generally has a deficit for the U.S.?
A.
Investment income
B.
Unilateral transfers
C.
Services
D.
Balance of payments
【判断题】H e was almost at the end of his tether when he stumbled on the solution of his difficulty. In the sentence, a metaphor is applied.
A.
正确
B.
错误
【单选题】What is the concentration of the solution which results when 50.0 mL of 1.0 M CuCl 2 solution is mixed with 100 mL of 4.0 M CuCl 2 solution ?
A.
0.45 M
B.
2.0 M
C.
3.0 M
D.
2.5 M
E.
None of the above
【简答题】Use mathematical induction to show that when n is an exact power of 2 , the solution of the recurrence
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