V带传动比平带传动能力大是因为V带与带轮工作面上的正压力大，因而摩擦力也大。() _机械设计_全学科试题题库

当前学科：机械设计

题目：未知类型
V带传动比平带传动能力大是因为V带与带轮工作面上的正压力大，因而摩擦力也大。()
答案： <查看本题扣1积分>

查看答案

答案不对？请尝试站内搜索

推荐知识点:

在CPU中，跟踪后继指令地指的寄存器是______。A、指令寄存器B、程序计数器C、地址寄存器D、状态条件寄存器

架设测量仪器三脚架时，三条腿分开的跨度要适中，跨度太大则（）。

会计上通常根据原始凭证编制会计报表。()

在生产上用来检验冶炼、热加工、热处理工艺质量的有效方法是（）。

以下属于公共资源广告类的是（）

国际工程项目招标中，如果业主规定了暂定工程量的项目和数量，但并没有限制这些工程量的估价总价款。若承包商估计今后实际工程量肯定会增大，则投标人对该暂定工程的报价策略是（）

Melissa Poe Melissa Poe was 9 years old when she （31） a campaign for a cleaner environment by writing a letter to the then President Bush. Through her own efforts， her letter was reproduced on over 250 donated billboards （广告牌）（32） the country. The response to her plea help was so （33） that Poe established Kids For A Cleaner Environment（Kids F.A.C.E.）in 1989. There are now 300，000 （34） of Kids F.A.C. E. worldwide and is the worlds largest youth environmental organization. Poe has also petitioned the National Park Service to （35） a "Children's Forest" project in every national park. In 1992， she was invited as one of only six children in the world to speak at the Earth Summit in Brazil as part of the Voices of the Future Program. In 1993， she was given a Caring Award for her （36） by the Caring Institute. Since the organization started， Kids F. A. C. B. members have distributed and planted over 1 million， trees! Ongoing tree-planting projects include the （37） of Kid's Yards-backyard wildlife habitats（栖息地） -and Kid F.A. C. E. is involved in the exciting Earth Odyssey， which is a great way to start helping. "Starting the club （38） out to be a way to help people get involved with the environment -club members started doing things like recycling， picking up litter and planting trees as well as inviting other kids to join their club." "We try to tell kids that it's not OK to be lazy，" she explains."You need to start being a responsible， environmentally （39）person now， right away，（40）you become a resource-sucking adult.” 39.（）

对于病原体检测的血清学实验，错误的有（）

柔性制造单元的英文缩写是（）。

结核球的CT表现中，哪项是错误的（）