【名词&注释】
二叉树(binary tree)
[单选题]下面各项中，哪一项不是标准的SQL语句?——
A. ALTER TABLE
B. ALTER VIEW
C. CREATE TABLE
D. CREATE VIEW
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举一反三：
[单选题]As an important phase in software development, software design is the continuation of software requirement analysis phasE．Ⅰ．software structure
A. software procedure
B. software module
C. software document
D. which of the following should be included in software design phase?
E. Ⅰand Ⅱ
F. Ⅱand Ⅲ
G. Ⅰ,Ⅱ and Ⅲ
H. All
[单选题]Which OSI layer does a Router operate at?
A. the Physical Layer
B. the Data Link Layer
C. the Transfer Layer
D. the Network Layer
[单选题]若一棵二叉树中只有叶结点和左右子树皆非空的结点，设叶结点的个数为k，则左右子树皆非空的结点个数是( )。
A. 2k
B. k-1
C. 2k-1
D. 2k-1
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