（）是为实现某一教学目标而制定的、付诸教学过程实施的整体方案，它包括合理组织教学过程

1吨=______千克 1千米=______米 30厘米=______分米5厘米=______毫米．

—What does he do?   

—         .   [ ]

A. He studies English

B. He does his homework

C. He's a student

D. He's my brother

下列关于圆锥型套筒冠固位体设计，说法错误的是（）

A.从审美角度考虑，一般上、下颌中切牙至第二前磨牙区选用金属烤瓷和金属树脂圆锥套筒冠固位体

B.以前牙、前磨牙作为基牙较为理想

C.固位体之间越分散越好，有利于平面固位

D.基牙牙槽骨吸收明显，乃至达3/5，仍可选用缓冲型圆锥型套筒冠固位体

E.磨牙的基牙牙冠高度较低时，应选用金属外冠圆锥型套筒冠固位体

Concerning the E.U.，which of the following statements is wrong？（）

A.A college student in Greece can get a job in the U.K.in summer vocation.

B.All the member countries adopt the currency，euro.

C.The executive body of the E.U. is the European Commission，headquartered in Brussels.

D.The Council of Ministers has the final power to decide E.U.actions.

造成泄漏损耗的原因有哪些？