人体的血液在各种血管中流动的速度是[ ]
A.动脉>静脉>毛细血管
B.毛细血管>静脉>动脉
C.静脉=动脉=毛细血管
D.静脉>动脉>毛细血管
A
根据句意填空。
1. The day before Thursday is .
2. Is the shop open or at this time of the day?
3. We have in the middle of the day.
4. He and his sister are in the school.
5. Mrs. Brown is Bill's mother, Bill is her .
如图是钠元素和氯元素在周期表中的信息,以及其三种粒子的结构示意图.据此判断下列叙述错误的是( )
A.氯的相对原子质量为35.45
B.①是一种阳离子,③是一种原子
C.钠元素单质常温下呈固态,而氯元素单质常温下呈液态
D.钠元素的原子序数为11