抗拉强度极限则表示钢材()的能力。

题型:填空题

问题:

抗拉强度极限则表示钢材()的能力。

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题型:填空题

下列关于二氧化碳的用途中,不正确的是(  )

A.制成多种电光源

B.做光合作用的原料

C.用作气体灭火剂

D.用于生产碳酸饮料

题型:填空题

关于胎盘合成的甾体类激素,下列哪些是正确的:

A.主要有孕激素和雌激素

B.孕激素于妊娠末期24小时尿中排出量<5mg

C.雌激素由胎儿胎盘单位产生

D.胎儿肾上腺及肝脏产生雌激素前身物质,是胎盘合成雌三醇的主要来源

E.测定孕妇血、尿或羊水中的雌三醇值,是为了了解胎儿在宫内的状况

题型:填空题

Our “Mommy and Me” time began two years ago. My next-door neighbor and fellow mother, Christie, and I were out in our front yards, watching seven children of age 6 and under ride their bikes up and down. “I wish I could take one of my children out alone,” said Christie.

Then we worked out a plan: When Christie takes one of her children out, I’ll watch her other three. And when she watches two of mine, I’ll take someone out.

The children were extremely quick to accept the idea of “Mommy and Me” time. Christie’s daughter, McKenzie, went first. When she returned, the other children showered her with tons of questions. McKenzie was smiling broadly. Christie looked refreshed and happy. “She’s like a different child when there’s no one else around,” Christie shared with me quickly. With her mother all to herself, McKenzie didn’t have to make an effort to gain attention.

Just as Christie had noticed changes in McKenzie, I also discovered something different in each of my children during our alone times. For example, I am always surprised when my daughter, who is seldom close to me, holds my hand frequently. My stuttering(口吃的)son, Tom, doesn’t stutter once during our activities since he doesn’t have to struggle for a chance to speak. And the other son, Sam, who’s always a follower when around other children shines as a leader during our times together.

The “Mommy and Me” time allows us to be simply alone and away with each child ---talking, sharing, and laughing, which has been the biggest gain. Every child deserves(应得到)to be an only child at least once in a while.

小题1:What is the text mainly about?

A.The experience of the only child being with mother.

B.The advantage of spending time with one child at a time.

C.The happy life of two families.

D.The basic needs of children.小题2: Right after McKenzie came back, the other children were _____________.

A.happy

B.curious

C.regretful

D.friendly小题3:What is one of the changes the author finds in her children?

A.The daughter acts like a leader.

B.Sam holds her hand more often.

C.The boys become better followers.

D.Tom has less difficulty in speaking.小题4:The author seems to believe that ___________.

A.having brothers and sisters is fun

B.it’s tiring to look after three children

C.every child needs parents’ full attention

D.parents should watch others’ children

题型:填空题

下列描述填方的填埋顺序不正确的是()。

A.先填石方,后填土方;

B.先填底土,后填表土;

C.先填近处,后填远处;

D.先填土方,后填石方;

题型:填空题

某电厂220kV双母线单分段接线,二回发变组接母线及六回出线,每段母线装一组PT和避雷器,若升压站运行方式为分段和母联断路器闭合,线路均匀接在三段母线上。

下列哪种回路只需在断路器的一侧装隔离开关()?

A.出线

B.分段

C.母联

D.发变组

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