一只火灾探测器能有效探测的单向最大水平距离，称为火灾探测器保护半径。（）
参考答案：对
把对话补充完整。
A.
A: Mum, l___________ hungry. 2___________ there any eggs in the fridge?
B: Yes, there are some.
A: 3___________ I 4___________ one, please?
B: Yes. But go and 5___________ your hands first.
A: OK. Mum.
B.
A: Oh, so 1___________ chocolates.
B: 2___________ 3___________ chocolates are there?
A: There are fifteen.
B: No, you're not 4___________. There are fourteen.
A: I'm sorry.
B: Let's 5___________ them 6___________.
A: OK. One 7___________ you and one for me...
无症状排阿米巴包囊者宜选用：
A．替硝唑
B．氯喹
C．二氯尼特
D．依米丁
E．甲硝唑
