读非洲简图和气候图,完成下列各题
x(元/件)
38
36
34
32
30
28
26
t(件)
4
8
12
16
20
24
假定试销中每天的销售量t(件)与销售价x(元/件)之间满足一次函数.
根据句意,写出括号内所给单词的适当形式。It's my cousin's ____ (twenty) birthday next week.The weather in Nanjing is ____ (pleasant) in summer. It's always too hot.People screamed with____ (excite) when the match began.He was so tired that he fell____ (sleep) soon after he went to bed.
下列对有关实验的变量的叙述,正确的是( )