问题
单项选择题
LD5/ED99（）
A．安全指数
B．治疗指数
C．半数致死量
D．安全界限
E．半数有效量
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
LD5/ED99（）
A．安全指数
B．治疗指数
C．半数致死量
D．安全界限
E．半数有效量
参考答案：D
| 补全对话。 | |
| A: Hey, John! B: Yes? A: Is Tim's dictionary on the table? B: 1______. It's on the bed. A: Where are Tim's English books? Are they in the bookcase? B: No, they aren't. 2______ A: Where is his pencil case then? B: 3______. A: And where's his video tape? B: It's under the table. 4______. A: Oh, thanks. And where are his CDs? B: 5______ A: Thanks.
|