A:∠1<∠2
B:∠1>∠2
C:∠3<∠4
D:∠3>∠4
(1,1),(1,2),(2,1),(1,3),(2,2),(3,1),(1,4),(2,3),(3,2),(4,1),(1,5),(2,4)…,则第60个数对是____
补全对话,每空一词。
A: ____ time do you usually get up, Bob?
B. I usually get up ____ 6 o'clock.
A. So early? What do you do then?
B: I ____ my teeth and ____ a shower. Then I eat my breakfast.
A: ____ do you go to school?
B: At 8 o'clock.
如图所示为一固体熔化、凝固曲线,回答下列问题.