下列关于脑性瘫痪的论述错误的是（） A.常见病因有宫内卒中，围生期创伤或缺血缺氧 B

头痛的发生机制包括

A．具有痛觉的颅神经和颈神经被刺激、挤压或牵拉

B．颈椎病变

C．头颈部肌肉的收缩

D．颅内外血管的收缩、扩张及受牵拉

E．脑膜受刺激及牵拉

正常情况下，一个西瓜果实内含有种子的数目取决于[ ]

A．一朵花中有多少雌蕊

B．一个胚珠中有多少个卵细胞

C．一个雌蕊中有多少个子房

D．一个子房中有多少胚珠

根据对话内容填入适当的单词补全对话，使句义完整，符合逻辑，每空限填一个单词。

A: 1.            in the room?

B: There are some kinds of robots made by the students in our school.

A: Really? What are they 2.             for?

B: The one with blue eyes is a guide robot. She can show you around our school.

A: 3.             about the taller one?

B: He is a cook robot. He can cook something nice for you.

A: Oh, I think that's a cleaning robot.

B: Maybe you're right. When he finds waste things, he'll pick them up. He can 4.             our environment clean.

A: That's wonderful! What good students! I'm proud of them.

B: So 5.              I.

硅酸盐水泥凝结硬化快，早期强度高，混凝土3天龄期的抗压强度比同强度等级的普通水泥混凝土高( )。

A．3%～7%

B．3%～8%

C．1%～3%

D．1%～8%

C62型四轴敞车换长是（）。（B、3、X）[05-00-01-04][020102]

A.1.1

B.1.2

C.1.3

D.1.5