D19型大平车的自重为（）t。A.142.0 B.177.0 C.180.0 D.1

This story is about a young man. He worked hard at his lessons. He was too busy. He didn’t have time to rest, so he was ill. Every night, when he went to bed, he closed his eyes and tried to sleep（睡觉）. But he couldn’t. He thought: “I must go to see the doctor.” He said to the doctor. “I can’t go to sleep at night.” “Try counting numbers. When you reach one thousand, you’ll be asleep.” The next day the man came back to the doctor’s office. “Well,” said the doctor, “How are you today?”

“Yes, he said,” I tried counting one, two, three. . . up to （直到）one thousand. But when I reached five hundred and sixty-nine, I began to feel sleepy (感到困倦). I had to get up and drank some tea. Then I went on counting up to one thousand. But I still couldn’t fall asleep.

小题1:The young man couldn’t go to sleep because ________ .

A．he didn’t finish his lessons

B．he worked too hard and was ill

C．he was worried about his homework

D．there was a lot of housework to do and he couldn’t have a good rest小题2:The doctor asked the young man ________ .

A．to count numbers before he went to bed

B．to put all numbers from 1 to 1000 together

C．to count numbers while he was lying in bed

D．to go to bed earlier小题3: The young man came back to the doctor’s office the next day because ___ .

A．he wanted to thank the doctor

B．he was better

C．he wanted to ask the doctor how to count the numbers

D．he still couldn’t go to sleep at night小题4:The young man ________ .

A．counted from 569 to 1000

B．counted from 1 to 569 and fell asleep

C．counted from 1 to 569 and got up to drink some tea

D．counted from 1 to 1000 and fell asleep小题5:The young man ________ in fact.

A．didn’t understand the doctor’s words.

B．couldn’t count numbers

C．didn’t try to sleep

D．wasn’t ill at all

有关系R(A, B, C) 和关系S(A, D, E, F)。如果将关系代数表达式πR.A, R.B，S.D, S.F (R.S)用SQL的查询语句来表示，则有：SELECT R.A, R.B, S.D，S.F FROM R, S WHERE ______。

简述面包粉和糕点粉成分的国际标准。

狼疮肾

A．以IgA为主的免疫球蛋白在系膜区沉积
B．C₃呈飘带样沿毛细血管襻沉积
C．IgA和白蛋白呈线样在毛细血管襻沉积
D．IgC和C₃呈颗粒样在毛细血管襻沉积
E．各种免疫球蛋白都呈阳性“满堂亮”现象

学术不正的原因，高校教师应该具有哪些学术品德，高校教师科研过程中规范要求。