男，42岁，搬重物后出现腰痛伴右下肢疼痛3d，咳嗽、喷嚏时疼痛加重，卧床休息时好转。体检弯腰活动明显受限，腰椎3～5棘突及右侧压痛，右侧直腿抬高40°（+），右小腿外侧痛觉减退，双侧跟腱反射和膝腱正常对称。X线示L_4-5椎间隙略窄。

为了明确椎间盘膨出的程度，做下列哪项检查最适宜（）。

A.CT

B.下肢神经传导速度检查

C.肌电图检查

D.下肢血流图检查

E.超声检查

The software architecture of a program or computing system is the structure or structures of the system, which comprise software ______, the externally ______properties of those components, and the relationships between them.The architecture is not the operational software. Rather, it is a ______ that enables a software engineer to: analyze the ______ of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the ______ associated with the construction of the software.

A. visibleB. reliable C. secure D. robust