前置胎盘产后大出血的原因是（）。
A.胎盘植入
B.子宫下段收缩力弱
C.凝血功能障碍
D.子宫下段易撕裂
E.产后未使用缩宫素
参考答案：B, D
在图像锐化技术中，能够对锐化量进行控制的锐化技术有（）。
A、USM锐化
B、锐化
C、明度锐化
D、边缘锐化技术
E、智能锐化技术
F、Lab锐化技术
In a certain animal population, for each of the first 3 months of life, the probability that an animal will die during that month is . For a group of 200 newborn members of the population, approximately how many would be expected to survive the first 3 months of life ？（）
A.140
B.146
C.152
D.162
E.170
. For a group of 200 newborn members of the population, approximately how many would be expected to survive the first 3 months of life ？（）