计划性风险自留的计划性主要体现在( )。A．风险可能性和损失机会B．损失机会和损失

两木块自左向右运动，现用高速摄影机在同一底片上多次曝光，记录下木块每次曝光时的位置，如图所示.连续两次曝光的时间间隔是相等的。由图可知

A．在时刻t₂以及时刻t₅两木块速度相同

B．在时刻t₃两木块速度相同

C．在时刻t₃以及时刻t₄之间某瞬时两木块速度相同

D．在时刻t₄以及时刻t₅之间某瞬时两木块速度相同

Nothing can destroy a vacation quicker than losing your money or credit cards. A few simple steps before you head out of the door can help protect your cash, card and personal information while you’re traveling.

Paul Stephens, a policy analyst San Diego, notes that people spend a lot of time planning their trips, from buying guidebooks to finding just the right beach outfits（装备）.“But their eyes glaze（呆滞） over when the subject of keeping money safe comes up,” he said.

“Why not take a few minutes to do something that could probably save your vacation?” Stephens asked．“In most cases, they can go on your to-do list with‘ buy travel bags’ and everything else,” he added.

The top recommendation is to clean your wallet. Remove unnecessary credit cards and any other unneeded documents that could compromise（危及...的安全）your identity(身份) if lost or stolen while you’re on vocation.

Then make a photocopy of the cards you’ve decided to take along and keep it in a secure location with you（not in your wallet）or leave it with a trusted relative or friend back home. Then you will know who you need to contact and how to reach it if your wallet is missing.

“Travelers should never leave their wallets or any identifying documents in their hotel room when they’re not there,” he said.” Choose a hotel with a safe to keep your valuable things in. Or keep your wallet and documents with you at all times. ”

小题1:According to passage, _______can destroy one’s vacation the most quickly.

A．being lost on vacation

B．losing money or credit cards

C．living in a bad hotel.

D．losing contact with family小题2:What does the underlined word stand for?

A．The people who are going traveling.

B．The outfits that are prepare4d for traveling.

C．The suggestions on what to buy when traveling.

D．The steps to avoid losing money or credit cards.小题3:What should people do with their wallet before they go on vacation?

A．Take it with them all the time.

B．Put it in a safe place at the hotel

C．Remove unnecessary cards and documents.

D．Leave it with family or friend.小题4:What is the topic of the passage?

A．How to prepare for travel.

B．How to be happy during your vacation.

C．How to keep cash and cards safe on vacation.

D．How to protect your luggage on vacation小题5:According to the passage, we know ______.

A．people don’t always know how to protect their money or credit cards

B．people should take a lot of money with them while traveling

C． people can leave their identifying documents in rooms, if the hotel is expensive

D．people can spend a few minutes preparing the luggage for travelling

《唐律疏议·名例律》：“诸犯罪未发而自首者，原其罪。其轻罪虽发，因首重罪者，免其重罪；即因问所劾之罪而别言余罪者，亦如之……即自首不实及不尽者，以不实不尽之罪罪之；至死者，听减一等。其知人欲告及亡叛而自首者，减罪二等坐之；即亡叛者，虽不自首，能还归本所者，亦同。其于人损伤，于物不可赔偿，即事发逃亡，若越度关及 * * ，并私习天文者，并不在自首之列。”

该段文字反映了唐朝的什么制度

随烧结矿碱度提高，烧结矿中（）的含量降低。

A、硫

B、氧化亚铁

C、铁酸钙

聚丙烯装置年设计符合为30万吨，丙烯设计单耗为1.009t/t，氢气单耗为：0.04kg/t，计算要完成年设计符合所需要的丙烯量？