制铝厂专门生产铝锭、铝制品或铝质零部件，该战略是（）.
A. 最终用户专业化
B. 垂直层面专业化
C. 顾客规模专业化
D. 产品线专业化
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Since his release from prison, Mr. Mitnick appeared on television as an expert offering advice about______.
Which country first passed the law banning human cloning
A. The United States.
B. The United Kingdom.
C. Switzerland.
D. Russia.
What has cloning bypassed
A. The nuclear transfer.
B. The process of taking DNA.
C. The normal reproductive process.
D. The creation of cells.
某二叉树中度为2的结点有18个，则该二又树中有______个叶子结点。
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