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【简答题】
按照杂化轨道理论,形成PCl3分子时,P原子采取不等性 杂化,分子空间构型为 ;形成 BBr3分子时,B原子采取 杂化,分子空间构型为 。
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举一反三
【单选题】Passage 3 The United States is on the verge of losing its leading place in the world's technology. So says more than one study in recent years. One of the reasons for this decline is the parallel decl...
A.
a. the number of PH.D. degree holders is declining
B.
b. the number of scientists and engineers is decreasing
C.
c. the number of 22-year-ilds is declining
D.
d. scientists and engineers are not employed
【单选题】The author cites the British example in order to______
A.
show that the problem of drank driving is worse in Britain than in the U.S.
B.
prove that stricter laws against drinking drivers would reduce traffic deaths
C.
prove that a slight increase in the number of arrests of drank drivers will not deter drunk driving
D.
suggest that taxation of alcohol consumption may be more effective than criminal laws
【单选题】It can be inferred from the passage that______.
A.
the problem of prejudice and discrimination in the U.S. will be solved soon
B.
blacks are free people now, so they can enjoy equal rights as whites
C.
prejudice and discrimination are more severe in the South than in the North
D.
now there are more blacks living in the North than in the South
【单选题】Some scholars have come ______ a new solution to the problem of population control.
A.
up
B.
up with
C.
down
D.
down with
【简答题】A．Its share of computer market has increased faster than Dell. B．H-P now holds the fifty percent of the market. C．It remains the first place of computer printers. D．It is now the largest comput...
【简答题】药物分子中引入磺酸基 查看材料
【单选题】It can be seen from the passage that the problem of resource conservation in agriculture ______.
A.
has been solved in the U.S.
B.
has not yet been paid any attention to
C.
is being seriously and effectively dealt with
D.
will soon be solved by using more capital and land
【简答题】Use more formal alternatives to the underlined words. Make any necessary grammatical changes. The book is mainly concerned with the problem of policing the internet. ( ) Almost every sc...
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