克劳物循环是采用( )的气体液化循环。
A.蒸汽制冷循环复叠 B.等焓膨胀和等熵膨胀组合C.等熵膨胀 D.节流膨胀。
参考答案:B
男性患儿,5岁。咳嗽2日,呈阵发性痉咳伴鸡鸣样回声,应考虑的是
A.急性喉炎
B.急性肺炎
C.百日咳
D.肺结核
E.麻疹
Rising Prices Cause House "Apartheid"
涨价导致房屋的“种族隔离”
According to the passage, housing apartheid’ refers to a situation where______.
A.houses are only built in specific places B.houses in some places become too expensive for people to buy C.black people and white people live in different houses in a place D.regulations are enforced on house pricing