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【多选题】
臀上神经支配的肌A.
臀大肌
B.
臀中肌
C.
臀小肌
D.
梨状肌
E.
阔筋膜张肌
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举一反三
【单选题】Our teacher asked us to hand in our homework _______. [ ]
A.
at times
B.
on time
C.
in time
【多选题】下列多元弱酸能分步滴定的有( )
A.
H2SO3(Ka1=1.3x10-2,Ka2=6.3x10-8)
B.
H2CO3(Ka1=4.2x10-7,Ka2=5.6x10-11)
C.
H2C2O4(Ka1=5.9x10-2,Ka2=6.4x10-5)
D.
H3PO3(Ka1=5.0x10-2,Ka2=2.5x10-7)
【简答题】As you know, science has had great effect on our lives since the ancient time. Nowadays science has a closer relation with our life. What’s the latest development in science and technology and how doe...
【多选题】下列多元弱酸能分步滴定的有()
A.
H2SO3(Ka1=1.3×10-2,Ka2=6.3×10-8)
B.
H2CO3(Ka1=4.2×10-7,Ka2=5.6×10-1)
C.
H2C2O4(Ka1=5.9×10-2,Ka=6.4×10-5)
D.
H3PO4(Ka1=5.0×10-2,Ka=2.5×10-7)
【简答题】下列多元弱酸能分步滴定的有( )。A. H2SO3(Ka1=1.3×10-2;Ka2=6.3×10-8) B. H2CO3(Ka1=4.2×10-7;Ka2=5.6×10-11) C. H2C2O4(Ka1=5.9×10-2;Ka2=6.4×10-5) D. H3PO3(Ka1=5.0×10-2;Ka2=2.5×10-7)
【单选题】Volunteering our time to help people ________ a good way to _______our free time.
A.
be; spend
B.
are; cost
C.
is; spend
D.
will; cost
【简答题】试用杂化轨道理论解释, BBr 3 为非极性分子,而 NF 3 为极性分子。并画出分子结构示意图。
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