当机器运转速度达到基础自然振动频率错误!未找到引用源。时,基础振幅将变得无穷大。

题型:判断题

问题:

当机器运转速度达到基础自然振动频率错误!未找到引用源。时,基础振幅将变得无穷大。

考点:二建机电专业继续教育二建机电专业继续教育题库
题型:判断题

下列关于多能造血干细胞的叙述,哪项是错误的()

A.造血干细胞形态和淋巴细胞相似

B.在特定条件下,可在脾内形成造血细胞结节

C.既能产生骨髓干细胞,又能产生淋巴细胞

D.具有高度的自我更新能力和向下进一步分化的能力

E.造血干细胞存在于骨髓中,血液中不存在

题型:判断题

样张是王红同学利用Word制作文档结果的一部分,其中剪贴画“青蛙”的环绕方式为()

 

A、四周型

B、紧密型

C、浮于文字上方

D、衬于文字下方

 

题型:判断题

既能清实热,又可退虚热的药物是()

A.石膏

B.知母

C.黄芩

D.苦参

E.栀子

题型:判断题

卵巢的形态学特征正确的是().

A.成年妇女卵巢大小约4cm×3cm×1cm

B.卵巢表面有腹膜覆盖

C.卵巢白膜是一层平滑肌组织

D.髓质内含数以万计的原始卵泡

E.卵巢内侧以骨盆漏斗韧带与子宫相连

题型:判断题

It’s a typical Snoopy card: cheerful message, bright colors, though a little yellow and faded now. Though I’ve received fancier, more expensive cards over the years, this is the only one I’ve saved. One summer, it spoke volumes to me.
I received it during the first June I faced as a widow to raise two teenage daughters alone. In all the emotional confusion of this sudden single parent- hood, I was overwhelmed with, of all things, the simplest housework: leaky taps, oil’ changes, even barbecues (烧烤). Those had always been my husband’s jobs. I was embarrassed every time I hit my thumb with a hammer or couldn’t get the lawnmower (割草机) started. My uncertain at- tempts only fueled the fear inside me: How could I be both a father and mother to my girls Clearly, I lacked the tools and skills.
On this particular morning, my girls pushed me into the living room to see something. (I prayed it wasn’t another repair job). The "something" turned out to be an envelope and several wrapped bundles on the carpet. My puzzlement must have been plain as I gazed from the colorful packages to my daughters’ bright faces.
"Go ahead! Open them!" they urged. As I unwrapped the packages, I discovered a small barbecue grill (烧烤架) and all the necessary objects in- eluding a green kitchen glove with a frog pattern on it.
"But why" I asked.
"Happy Father’s Day!" they shouted together.
"Moms don’t get presents on Father’s Day," I protested.
"You forgot to open the card," Jane reminded. I pulled it from the envelope. There sat Snoopy, on top of his dog house, merrily wishing me a Happy Father’s Day. "Because," the girls said, "you’ve been a father and mother to us. Why shouldn’t you be remembered on Father’s Day"
As I fought back tears, I realized they were right. I wanted to be a "professional" dad, who had the latest tools and knew all the tricks of the trade. The girls only wanted a parent they could count on to be there, day after day, performing repeatedly the maintenance tasks of basic care and love.
The girls are grown now, and they still send me Father’s Day cards, but none of those cards means as much to me as that first one. Its simple message told me being a great parent didn’t require any special tools at all--just a willing worker.

The girls gave their mother a barbecue set probably because

A. it was what their mother wanted
B. it was a proper Father’s Day gift
C. barbecue was their favorite food
D. they wanted their mother to barbecue

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