下列气候特征中,与我国气候特征相符的是( )
A:海洋性
B:大陆性
C:酷寒性
D:单一性
有关长江的说法,正确的是( )
解决水资源时间分布不均的主要办法是
Bob: What do you usually____ (do) on Sunday, Ann?
Ann: I usually____(go) to the library with my sister, Betty. But sometimes my grandfather____(go) with me. He____(like) reading very much.
“PZ220-25”正常工作时的电阻多大?如果未接入电路前由于灯丝温度低,电阻仅为350Ω,此灯泡在开灯瞬间实际功率多大?
x
10
15
20
25
30
35
40
y
5
6
12
14
23