试题与答案

对高、重、大型的塔类设备，多采用双桅杆或多桅杆起重机滑移抬吊法吊装。

来源：www.tikuol.com
题型：判断题

题目：

对高、重、大型的塔类设备，多采用双桅杆或多桅杆起重机滑移抬吊法吊装。

答案：

参考答案：对

考点：天车工考试中级天车工中级天车工题库
试题推荐
题型：阅读理解
阅读理解。
     Plants are very important living things. Life could not go on if there were no plants. This is because
plants can make food from air, water and sunlight. Animals and men can't make food from air, water and
sunlight. Animals get their food by eating plants and other animals. Therefore, animals and men need plants
in order to live. This is the reason why we find so many plants around us.
    If you look carefully at the plants around you, you will find that there are many kinds of plants. Some
plants are large while others are small. Most plants are green.
    Some plants have many small leaves. Others have only a few. There are many kinds of leaves. Leaves
are of different shapes and colors.
     Leaves are also different in other ways. Some leaves have long thin parts at the end, we call them leaf
stalks, some have short leaf stalks, others even have no leaf stalks. The leaf edges are also different. Some
leaves have smooth (平滑) edges. Some have a wave-shaped edges. Others have edges like the teeth of a
saw (锯子).
1. Which of the following shows the right relation (关系) according to the first paragraph?
[ ]
2. Plants are important because ______.
[ ]
A. we need to eat plants every day
B. men can't live without plants
C. we can see so many plants around us
D. animals eat plants as their only food
3. We know from the passage that ______.
[ ]
A. all leaves have leaf stalks
B. all leaves have smooth edges
C. plants are different in shapes but have the same color
D. leaves are different in shapes and colors
4.The underlined word "leaf stalks" in the last paragraph means ______.
[ ]
A. 叶边
B. 叶纹
C. 叶柄
D. 叶尖
5. The main idea of the passage is ______.
[ ]
A. how plants help men and animals
B. plants are important and they are quite different
C. plants are more important than air, water and sunlight
D. why we find so many plants and around us.
查看答案
题型：解答题
已知x＞
1
2
，函数f（x）=x2，h（x）=2e lnx（e为自然常数）．
（Ⅰ）求证：f（x）≥h（x）；
（Ⅱ）若f（x）≥h（x）且g（x）≤h（x）恒成立，则称函数h（x）的图象为函数f（x），g（x）的“边界”．已知函数g（x）=-4x2+px+q（p，q∈R），试判断“函数f（x），g（x）以函数h（x）的图象为边界”和“函数f（x），g（x）的图象有且仅有一个公共点”这两个条件能否同时成立？若能同时成立，请求出实数p、q的值；若不能同时成立，请说明理由．
查看答案
微信公众账号搜索答案