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【单选题】
Which of the following statements about the statistics of pet ownership in the US is wrong?A.
It's estimated that 78 million dogs & 85.8 million cats are owned in the United States. ～44% of all households in the United States have a dog, & 35% have a cat, according to American Pet Products Association (APPA).
B.
APPA reports that 64% of dogs are purchased from breeders, while 23% of dogs & 31% of cats are obtained from an animal shelter or humane society.
C.
～6.5 million companion animals enter US animal shelters nationwide every year. Of those, ～3.3 million are dogs and 3.2 million are cats.
D.
Each year, ～1.5 million shelter animals are euthanized (670,000 dogs & 860,000 cats). ～3.2 million shelter animals are adopted per year (1.6 million dogs & 1.6 million cats).
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【单选题】根据感染的原因及病变特点，临床将化脓性骨髓炎分为两种类型，即( )
A.
急性颌骨骨髓炎和复发性颌骨骨髓炎
B.
牙源性颌骨骨髓炎和损伤性颌骨骨髓炎
C.
中央性颌骨骨髓炎和边缘性颌骨骨髓炎
D.
牙源性颌骨骨髓炎和血行性颌骨骨髓炎
E.
损伤性颌骨骨髓炎和血行性颌骨骨髓炎
【简答题】变量轴向柱塞泵排量的改变是通过调整斜盘 的大小来实现的。A. 倾角
【简答题】化脓性颌骨骨髓炎根据感染的病因及病变特点,可将其分为 ___________ 和 ___________ 两种类型 。
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