腹腔穿刺液中有大量中性粒细胞，革兰染色阴性杆菌E．
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某区域土地的基础设施和公用设施齐全，有利于该区域土地价格的提升。
A. 正确
B. 错误
Among other things，the story shows that
A. good will be rewarded with good．
B. it is okay to accept pay for a kindness．
C. it is wise neither to borrow nor to lend．
D. where there'S a will there'S away．
具有下列化学结构的药物为
A. 环磷酰胺
B. 异环磷酰胺
C. 卡莫司汀
D. 美法仑
E. 白消安
The condition where our wants are greater than our resources is called______.
A. opportunity cost
B. disutility
C. economic loss
D. scarcity
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