割草机的消声器就是一个包含至少两个子系统的系统:一具保护性外套和多孔的吸收材料。

A、对

B、错

相关热点: 割草机   保护性   消声器   子系统  

查看答案

相关问题推荐

  • 题目李华每周储蓄35元,如果他现在已有100元存款,那么需多少天他能买上一台价值240元的割草机?(    )
    A:4
    B:6
    C:28
    D:21
    查看答案
  • It's a typical Snoopy card; cheerful message, bright colors, though a little yellow and faded now. Though I've received fancier, more expensive card 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 parenthood, I was overwhelmed with, of all things, the simplest housework, leaky taps, oil changes, even barbeques(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 attempts 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 including 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.
    By "it spoke volumes to me", (Para. 1) the mother in the story means the card______.
    A.conveyed significant meanings to her
    B.aroused great sorrow in her
    C.brought her pleasant feelings
    D.made her feel important

    查看答案
  • 抽览姜吵雄慌屿品款.下列选项中即玉澡脉况券石找似百差献,可以申请外观设计专利的是遵哗暴抚淘许割猪异(围墓涉释)

    A、一种新的调味品

    B、一种糖尿病的治疗方法

    C、一种造型独特的割草机

    D、一幅美术作品

    查看答案
  • 著名的大地艺术家斯坦·赫德用什么工具在65公顷的土地上作画?()

    A、坦克

    B、拖拉机

    C、割草机

    查看答案
  • 伊恩在完全竞争的修剪草坪行业中提供服务。他的固定成本是每天7美元(租割草机的成本),可变成本如下表所示。

    a.伊恩的生产总成本是多少?在表中“总成本”一栏填写。b.计算每次修剪草坪的市场价格为9美元时伊恩的利润。如果修剪草坪的市场价格是每次9美元,那么伊恩会修剪多少草坪?他的利润是多少?他在短期中会继续修剪草坪么?c.计算每次修剪草坪的市场价格为3.60美元时伊恩的利润。如果修剪草坪的市场价格是每次3.60美元,那么伊恩会修剪多少草坪?他的利润是多少?他在短期中会继续修剪草坪么?

    查看答案
  • For this part, you are allowed 30 minutes to write a letter to express your congratulations to one of your classmates upon successfully starting a business. You should write at least 120 words but no more than 180 words.

    分值: 2
    查看答案
  • 总价包干合同工程量计算不能出现什么?A.漏项B.错项C.不计算D.计算不全
    查看答案
  • ()不可以作为政府购买服务的承接主体?
    A.
    公益一类事业单位
    B.
    —新成立的企业
    C.
    一农村集体经济组织
    D.
    基层群众性自治组织
    查看答案
  • 教育方针的特点主要包括
    查看答案
  • 全面建设社会主义现代化国家,最艰巨最繁重的任务仍然在()
    查看答案