电缆隧道内的照明电压应不高于( )V，如高于( )V应采取防止触电的安全措施。

阅读理解

Mr. White works in an office. One day, when he had lunch, a friend came to visit him . They were very happy and talked a lot. Then they looked at the clock on the wall. It was time to go to office. He had to say goodbye to his friend and left. It was raining hard and the streets were wet. He drove too fast to see the red lights . And he couldn’t stop his car and hit a car in front of his. An old man got off and called out angrily, “ What are you doing? Do you want to hit me to death?”

“I’m sorry , sir,” said Mr. White . “I didn’t find the lights turned red.” Then he brought out a bottle of wine and gave it to the old man .

“ It’s very cold today , sir ,” said Mr. white . “Please drink a little , then you’ll be warmer.” The old man drank some wine and became happy. “I’m feeling much better now. Why don’t you drink any?” he asked.

I can’t drink anything now ,sir,” answered Mr. White.

I’m waiting for the policeman to come. Only drunkards (酒鬼) cause accidents, you know!”

小题1: The story happened________________.

A．in the morning

B．in the afternoon

C．in the evening

D．at night小题2:Mr White drove too fast because _______________

A．he was happy that day

B．he was good at drinking

C．there were few cars in the street

D．he was afraid to be late小题3:Mr White hit the car because  ________.

A．he didn’t see it

B．it was raining hard

C．he couldn’t stop his in time

D．he couldn’t drive at all.小题4: Mr. White gave a bottle of wine to the old man ________.

A．to put the blame onto the old man

B．to make him happy

C．to make him warm

D．to leave there before the policeman小题5:At last ___________________.

A．the old man felt much better

B．the old man was friendly to Mr. White

C．Mr. White drank some ,too.

D．Mr. White fooled the old man .

左向右分流性先天性心脏病最常见的并发症是（）

A.肺炎、心力衰竭

B.脑梗死

C.脑脓肿

D.亚急性感染性心内膜炎

E.咯血

关于上市公司不得公开发行证券的情形，下列说法错误的是（）。

A、本次发行申请文件有虚假记载、误导性陈述或重大遗漏

B、上市公司及其控股股东或实际控制人最近24个月内存在未履行向投资者作出的公开承诺的行为

C、擅自改变前次公开发行证券募集资金的用途而未作纠正

D、上市公司最近12个月内受到过证券交易所的公开谴责

男性，50岁。上消化道大出血入院。既往有乙肝病史20年。急诊胃镜检查，诊断为食管静脉曲张破裂出血。实验室检查：胆红素40μmol/L，白蛋白30g/L，腹腔少量积液。营养良好。如需急诊手术，首选下列哪种术式（）.

A.脾切除，贲门周围血管离断术

B.脾切除

C.门腔分流术

D.脾肾静脉分流术

E.脾肾静脉分流术

如图所示，自行车的半径为R，车轮沿直线无滑动地滚动，当气门芯由轮子的正上方第一次运动到轮子的正下方时，气门芯位移的大小为多少（）

A.πR

B.

C.2πR

D.2R