关于X线滤过的说法，错误的是（） A.滤过是把X线束中的低能成分吸收掉 B.固有滤过

48 （单项选择题）          

A.Thompson was shocked and devastated.

B.Another trial was held.

C.I cannot begin to imagine what would have happened had my mistaken identification occurred in a capital case.

D.During the attack, she made an effort to memorize every detail of his face , looking for scars , tattoos (纹身) or other identifying marks.Jennifer

E.Many criminals are sent to prison on the basis of accurate testimony by eyewitnesses.

F.Jennifer Thompson decided to meet Cotton and apologize to him personally.

“特殊效果”属性值用于设定控件的显示特效，以下不属于“特殊效果”属性值的是______。

A) “凹陷”
B) “颜色”
C) “阴影”
D) “凿痕”

创卫检查中居民健康知识和健康行为的考核对象和方法是什么？

土地的经济地理位置具有（）。

A.不可位移性

B.可垄断性

C.可变性

D.多样性

电场强度的单位是（）

A.V/m

B.A/m

C.μW/cm

D.g/cm

E.mg/L