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【单选题】
无籽西瓜的形成原因是()。
A.
秋水仙素的直接影响
B.
转基因
C.
特定品种的人工授粉
D.
四倍体西瓜与二倍体西瓜杂交
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举一反三
【简答题】Identify and briefly describe some of the forces that have resulted in increased global integration and the growing importance of global marketing.
【多选题】常温下,将某一元酸HA和NaOH溶液等体积混合,实验信息如下,下列判断不正确的是 实验编号 c(HA)/ mo1·L -l c(NaOH)/ mol·L -1 反应后溶液pH 甲 0.1 0.1 pH =9 乙 c 1 0.2 pH =7
A.
c l 一定等于0.2
B.
HA的电离方程式是HA H + +A -
C.
乙反应后溶液中:c(Na + )=c(HA)+c(A 一 )
D.
甲反应后溶液中:c(Na + )>c(A 一 )>c(OH 一 )>c(H + )
【简答题】Describe some of the trade-offs faced by each of the following: c. a professor deciding how much to prepare for class.
【简答题】Describe some of the trade-offs faced by each of the following: b. a company president deciding whether to open a new factory.
【单选题】常温下,将某一元酸HA和NaOH溶液等体积混合,两种溶液浓度和混合所得溶液的pH如下表所示 下列说法中,不正确的是 [     ]
A.
由实验①可知,HA为弱酸
B.
实验①所得混合溶液:c(Na + )>c(A - )>c(OH - )>c(H + )
C.
实验②所得混合溶液:c(Na + )=c(A - )
D.
实验③所得混合溶液中由水电离出的OH - 的浓度为1×10 -9 mol/L
【单选题】常温下,将某一元酸HA和NaOH溶液等体积混合,两种溶液的浓度和混台后所得溶液 的pH如下表: 下列判断不正确的是
A.
HA的电离方程式为:
B.
不考虑其他组的实验结果,
C.
③组实验中,混合溶液中
D.
①组实验中,混合溶液中
【简答题】Describe some of the global marketing strategies available to companies. Give examples of companies that use the different strategies.
【简答题】Describe some of the eating habits of the Chinese.
【简答题】Describe some of the advantages and disadvantages of using cloud computing and cloud storage.
【简答题】Describe some of the trade-offs faced by each of the following: a. family deciding whether to buy a new car
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