法律文书大都有固定的结构，法律文书的首部要写明( )
A．案件事实
B．处理决定
C．附注说明
D．制作机关
参考答案：D
Distinguished guests and friends, welcome to our school, _____ the ceremony of the 50th Anniversary this
morning are our alumni (校友) from home and abroad. [ ]
A. Attend
B. To attend
C. Attending
D. Having attended
实质性病变的声像图中，哪项错误
A．侧方声影有或无B．后方回声不变或衰减C．外形规则或不规则D．内部无回声E．边缘光滑或不光滑
