【简答题】进入人体内的放射性核素作为辐射源对人体的照射称( )。
【多选题】建筑物的局部剖面图,如习图3.2.2所示。室外地坪填土是在结构封顶以后进行的,在下列计算中,()所取用的d是正确的。()
A.
外墙基础沉降计算时,附加应力=总应力-rmd中,d取5.0m
B.
外墙地基承载力修正的埋深项ηdrm(d-0.5)中,d取1.0m
C.
中柱基础沉降计算时,附加应力=总应力-rmd中,d取3.0m
D.
中柱地基承载力修正的埋深项ηdrm(d-0.5)中,d取3.0m
【判断题】内照射是指进入人体的放射性核素作为辐射源发出的射线从体内对人体产生的照射。
【单选题】7 The media once portrayed the governor as anything but ineffective; they now, however, make her out to be the epitome of ________.
【简答题】利用级数和求出π的值。 使用格里高利公式求π的近似值,直到最后的一项绝对值小于 为止。
【多选题】总采购成本是指企业经营中因采购物料而发生的费用,包括( ) prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【单选题】It can be inferred from the passage that precipitation formed from evaporated ocean water has______
A.
the same isotopic ratio as ocean water
B.
less oxygen 18 than does ocean water
C.
less oxygen 18 than has the ice contained in continental ice sheets
D.
a different isotopic composition than has precipitation formed from water on land
E.
more oxygen 16 than has precipitation formed from fresh water
【多选题】统计在研究社会经济现象的数量方面时,具有( )的特点