问题
单项选择题
采用扣件式钢管脚手架作模板立柱支撑时，立柱必须设置纵横向扫地杆，纵上横下，使直角扣件与立杆扣牢须在离地（）。
A．200mm处
B．250mm处
C．300mm处
D．350mm处
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
采用扣件式钢管脚手架作模板立柱支撑时，立柱必须设置纵横向扫地杆，纵上横下，使直角扣件与立杆扣牢须在离地（）。
A．200mm处
B．250mm处
C．300mm处
D．350mm处
参考答案：A
| 完形填空。 | ||||
| Many people know Robert Schumann (舒曼) was an important musician, but they don't l his wife, Clara Wieck Schumann, was in fact more famous than he in their time. Clara was born in 1819. In her 2 , most women didn't go out. Clara, however, 3 to play the piano in public at the age of nine and was very _ 4 . In 1840, Clara got married (结婚). She became very 5 with the housework and her children. It was hard for her to find time to practice the 6 . But Clara could never 7 her love for music; she felt she had to 8 it with other pcoplc. In 1842, Clara began to play again. When Robert died in 1856, Clara had to make money for their children by herself. She 9 music'and played the piano around Europe. During this hard time, music always made her happy. Clara died at 77. Now she is still thought to be onc of the bcst 10 in history. | ||||
|
由世界自然基金会发起的“地球１小时”活动，已发展成为最有影响力的环保活动之一，今年的参与人数再创新高，然而也有部分公众对该活动的实际效果与负面影响提出了疑问，对此，某新闻媒体进行了网上调查，所有参与调查的人中，持“支持”、“保留”和“不支持”态度的人数如下表所示：
（Ⅱ）在持“不支持”态度的人中，用分层抽样的方法抽取5人看成一个总体，从这5人中任意选取2人，求至少有1人20岁以下的概率； （Ⅲ）在接受调查的人中，有8人给这项活动打出的分数如下：9.4,8.6,9.2,9.6,8.7,9.3,9.0,8.2，把这8个人打出的分数看作一个总体，从中任取1个数，求该数与总体平均数之差的绝对值超过0.6的概率. |