已知a>b,且c为正数,那么在下列代数式中正确的是( )。
A.a>b+c
B.ac>bc
C.a>c
D.b>c
参考答案:B
补全对话。
根据对话内容填入所缺单词,使对话意思完整,每空只填一词。
A: Good afternoon. Tom.
B: Good afternoon, Lucy. Nice see you here.
A: I to this neighbourhood last Monday.
B: to my neighbourhood.
A: Thank you. the way, I want to some food for supper. Where is the grocery shop?
B: Go this road. When you to the main street, turn right. And turn right . You will see
a blue building on the left. It's the grocery shop. It's to find.
A: Thank you very much.
B: Not all.
在分析食物中毒的可疑食物时,最常用的指标是()
A.总发病率
B.二代发病率
C.患病率
D.病死率
E.吃不同食物的罹患率