对某个数据库对象重命名的宏操作是( )。A．CopyObject B．Delete

附合水准路线高差闭合差的计算公式为______

A．f_h=H_始+∑h_往+∑h_返
B．f_h=∑h_往+∑h_返
C．f_h-∑h_测-(H_B-H_A)
D．f_h=∑h_测

根据括号内的汉语提示，完成句子。

1. Han Han has __________ (写) some popular novels in the recent years.

2. The young couple had great fun __________ (躺) on the beach in Hawaii.

3. The tourists from home and abroad lost __________ (他们自己) in the scenery

    in Mount Sanjiao last summer.

4. The more regularly you eat, the __________ (更健康) you are.

5. Qian Xuesen is one of the greatest __________ (科学家) in the world.

6. The __________ (第十二) lesson is the most difficult in Book Three.

滤波器中，一般规定幅频特性值等于1.414A时所对应的频率称为截止频率。（）

阅读理解。

     As prices and building costs keep rising, the "do-it-yourself" (DIY) trend (趋势) in the U.S. continues to

grow. "We needed furniture for our living room," says John Ross, "and we just didn't have enough money to

buy it. So we decided to try making a few tables and chairs." John got married six months ago, and like many

young people these days, they are struggling to make a home at a time when the cost of living is very high.

The Rosses took a 2-week course for $ 280 at a night school. Now they build all their furniture and make

repairs around the house.

    Jim Hatfield has three boys and his wife died. He has a full-time job at home as well as in a shoe making

factory. Last month, he received a car repair bill for $ 420. "I was deeply upset about it. Now I've finished a

car repair course, I should be able to fix the car by myself."

    John and Jim are not unusual people. Most families in the country are doing everything they can to save

money so they can fight the high cost of living. If you want to become a "do-it-yourselfer", you can go to

DIY classes. And for those who don't have time to take a course, there are books that tell you how you can

do things yourself.

1. We can learn from the text that many newly married people _____. [ ]

A. find it hard to pay for what they need

B. have to learn to make their own furniture

C. take DIY courses run by the government

D. seldom go to a department store to buy things

2. John and his wife went evening classes to learn how to _____. [ ]

A. run a DIY shop

B. make or repair things

C. save time and money

D. improve the quality of life

3. Jim Hatfield decided to become a do-it-yourselfer when _____. [ ]

A. his car repairs cost too much

B. the car repair class was not helpful

C. he could no possible do two jobs

D. he had to raise the children all by himself

4. What would be the best title for the text? [ ]

A. The Joy of DIY

B. You Can Do It Too!

C. Welcome to Our DIY Course!

D. Ross and Hatfield: Believers in DIY.

当船长大于200m或纵骨采用了高强度钢时，船底纵骨应（）。

Ⅰ穿过水密肋板；

Ⅱ中断于水密肋板；

Ⅲ也可采用相应的替代结构

A.Ⅰ、Ⅱ

B.Ⅰ、Ⅲ

C.Ⅱ、Ⅲ

D.Ⅰ、Ⅱ、Ⅲ