在△AOB中,已知OA=4,OB=2,点D是AB的中点,则OD•AB=_____

题型:填空题

问题:

在△AOB中,已知OA=4,OB=2,点D是AB的中点,则
OD
• 
AB
=______.
考点:向量数量积的运算
题型:填空题

阅读理解。

     Mr. Brown is a very old man. Every morning he goes for a walk in the park. And he comes home at

twelve thirty for his lunch. But today a police car stops at his house at twelve o'clock. Two policemen

help him out. One of them says to Mr. Brown's daughter, "The old man can't find his way in the park.

He asks us to take him home in the car." The daughter thanks the policemen. After they leave, she asks

her father, "Dad, you go to that park every day. But today, you can't find the way. What's wrong with

you?" The old man smiles like a child and says, "I can find my way home. I don't want to walk home

today, you know?"

1. Every day Mr. Brown comes home at _____. [ ]

A. twelve

B. eleven

C. twelve thirty

D. twelve ten

2. Today Mr. Brown comes home by _____.[ ]

A. bus

B. car

C. bike

D. taxi

3. The policeman says Mr. Brown _____.[ ]

A. doesn't want to walk home

B. can't find his way home

C. find his way

D. knows the way

4. Mr. Brown's daughter thinks _____.[ ]

A. he wants to go home

B. he wants to have lunch early

C. he doesn't want to go to the park

D. something is wrong with him

5. Mr. Brown says _____.[ ]

A. he can't find the way home

B. he wants to go home on foot

C. he knows the policemen

D. he doesn't want to walk home today

题型:填空题

有以下程序: main() { int i=1,j=2,k=3; if(i++==1&&(++j==3||k++==3)) printf("%d%d%d\n",i,j,k); } 程序运行后的输出结果是【 】。

A.1 2 3

B.2 3 4

C.2 2 3

D.2 3 3

题型:填空题

患儿,男,6小时。第一胎第一产,孕40周自然产,娩出时脐带绕颈1周,1分钟与5分钟Apgar评分分别为3分、7分。体检:小儿易激惹,拥抱反射增强,肌张力高。最可能是()

A.新生儿低血钙

B.新生儿低血糖

C.新生儿脑膜炎

D.脑室管膜下出血

E.新生儿缺氧缺血性脑病

题型:填空题

电网中带基本负荷的机组的速度变动率应适当()

A.大些

B.小些

C.保持额定值

题型:填空题

关于土地使用权抵押权的法律特征,说法正确的有()。

A.土地使用权抵押权是担保物权

B.土地使用权抵押权是债务人或者第三人以其所有的或者有处分权的土地使用权设定的物权

C.土地使用权抵押权是转移土地使用权占有的物权

D.抵押权人无权就抵押的土地使用权卖得价金优先受偿

E.土地使用权的抵押权设定范围受限制

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