胎儿淋巴囊肿的临床和超声表现，下列正确的是（）

A.是由淋巴系统梗阻所致

B.囊壁上血流信号丰富

C.囊壁较厚，内有分隔及 * * 状突起

D.多为囊实性包块

E.确诊的最好方法是MRI

You have recently appointed a project manager to handle a critical project in your organization．You want to provide the project manager with authority to apply organizational resources to project activities．Which document should you use ？（）

A．Resource authorization documen

B．Work breakdown structur

C．Project charte

D．Project scope statemen