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【单选题】
关于脊髓外形的描述，正确的是A.
脊髓和椎管等长
B.
成人脊髓下端平 第1腰椎下缘
C.
颈、胸和腰神经根形成马尾
D.
脊髓下端变细为终丝
E.
脊髓腹面有前正中沟，背面有后正中裂
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】They letting him go and would like him to stay on after his present contract expires.
【单选题】They letting him go and would like him to stay on after his present contract expires.
A.
regardless of
B.
left behind
C.
gave away
D.
had no intention of
【简答题】Fill in the blanks with the expressions learned in this module. Change the form where necessary. 1. The Chinese swimmer was at the beginning of the women ’ s 100-meter freestyle final, but she didn ’ ...
【单选题】欲配制 pH=3 的缓冲溶液 , 从缓冲容量考虑 , 应选用的最佳弱酸是 ( )及其共轭碱。 草酸 (pK θ a1 =1.27) 邻苯二甲酸 (pK θ a1 =2.95) 酒石酸 (pK θ a =4.37) 磷酸 (pK θ a1 =2.12)
A.
草酸
B.
邻苯二甲酸
C.
酒石酸
D.
磷酸
【单选题】欲配制 pH=3 的缓冲溶液 , 从缓冲容量考虑 , 应选用的最佳弱酸是 ( ) 草酸 (pK θ a1 =1.27) 邻苯二甲酸 (pK θ a1 =2.95) 酒石酸 (pK θ a =4.37) 磷酸 (pK θ a1 =2.12)
A.
草酸
B.
邻苯二甲酸
C.
酒石酸
D.
磷酸
【单选题】They _________ letting him go and want him to stay on after his present contract expires.
A.
has an intention of
B.
has no intention of
C.
have an intention of
D.
have no intention of
【简答题】磷酸的 pK a1 =2.12 , pK a2 =7.21 , pK a3 =12.66 。溶液中 H 2 PO 4 - 分布分数最大时,pH= ,溶液中 HPO42- 分布分数最大时, pH= 。
【简答题】卢梭忽视（）教育。
【单选题】磷酸 pK a 1、 pK a 2、 pK a 3 分别为2.12、7.20、12.36,在pH=1.0的磷酸溶液中,磷酸的主要存在形体为( )
A.
磷酸根
B.
磷酸一氢根
C.
磷酸二氢根
D.
磷酸分子
【简答题】They had no plan of letting him go.
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