血瘀头痛的辨证要点是什么？

The farm as well as its neighboring hills which we once spent so

much time ______ on a new look as recently as last year. [ ]

A. on has taken

B. has taken

C. on having taken

D. having taken

丈夫为妻子投保死亡保险一份，五年后夫妻离婚，则离婚后保险合同的效力状况是（）

A.立即失效

B.自动解除

C.继续有效

D.中止效力

患者，男，60岁。下肢慢性溃疡10年，出现疼痛伴出血2个月。查体：左下肢内踝上方有一2.5cm×2.5cm溃疡，中央凹陷，肉芽呈灰白色，少许脓性渗出物，边缘隆起，触之易出血。为明确诊断最好采用下列哪项检查

A．穿刺活检
B．切取活检
C．脱落细胞检查
D．切除活检
E．X线片

CCD摄像机按视频扫描制式划分，主要有（）制和NTSC制两种。

A.PAL

B.EIA

C.CCIR

D.ASP

国际货运代理的服务对象有哪些