皮皮学，免费搜题
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搜题
【单选题】
LD50 与毒性评价的关系是A.
LD50 值与毒性大小成正比
B.
LD50 值与急性阈计量成反比
C.
LD50 与毒性大小成反比
D.
LD50 值与染毒剂量成正比
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皮皮学刷刷变学霸
举一反三
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Charles R. Drew was a medical student at Columbia University in New York. Befor...
A.
A place where blood is stored.
B.
A place where blood is sold.
C.
A place where blood is borrowed.
D.
A place where you can use blood.