肛裂反复发作的后果可表现为 A．肛门后方形成瘢痕 B．肛门后方形成皮赘 C．肛门口紫

缓脉的临床意义是（）

A.气滞血瘀，痰湿内停

B.气血两虚，湿邪为病

C.脏器衰微，跌打损伤

D.阳极阴竭，元阳将脱

E.脾胃虚弱，湿邪内阻

老年人较青年人发病率更高的疝是

A．脐疝

B．腹股沟直疝

C．腹股沟斜疝

D．绞窄性疝

E．嵌顿性疝

威灵仙的主治病证不包括（）

A.风寒湿痹

B.瘫痪麻木

C.痰饮积聚

D.湿热痹痛

E.诸骨鲠喉

The shear rams of a ship blowout preventer stack are used in emergency well control to（）.

A.close and seal around the drill pipe

B.close and seal around casing

C.cut off pipe inside the preventer stack

D.close and seal around drill collars

X线平均波长与最短波长(10)的关系是

A．λ_mean=0.5λ₀
B．λ_mean=1.0λ₀
C．λ_mean=2.0λ₀
D．λ_mean=2.5λ₀
E．λ_mean=3.5λ₀