属于静荷载的是：（）A、作业人员B、脚手板C、水泥_爱下问搜题

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问题单项选择题

属于静荷载的是：（）

A、作业人员

B、脚手板

C、水泥

答案

参考答案：B

选择题

常言道：蛛丝马迹．这说明蛛丝十分纤细，但是科学研究又发现蛛丝非常坚韧．蛛丝有黏性，当昆虫不慎落入蛛网被黏住后，进行挣扎时，藏在隐蔽处的蜘蛛会立即爬上蛛网，将昆虫抓住．人类利用农田蜘蛛防治害虫的优点不包括（　　）

A．减少施用农药

B．防止对环境造成污染

C．对植物无伤害

D．用蛛丝代替蚕丝

完形填空

My brother and I were alone in our apartment. My parents had gone for a party and had left me in 36.I was doing my homework while my younger brother was watching television. 37 the doorbell rang. My younger brother rushed to the door thinking that our parents had come home; he unlocked the door and 38 it.
Outside, stood a tall man wearing a black raincoat. He said that he was a salesman and asked 39 if our mother or father was at home.
Without 40 , my brother said, “No.” He asked if we would like to 41 some comic books, which he was selling. I quickly explained that we were not 42 to buy anything without our parents’ 43 .
Then, as I was about to close the door, he 44 his way into our house. He took out a 45 and forced me to 46 up my brother’s hands with some rope. I tied up his hands but I tied it in a 47 way so my brother could untie himself. The man then tied my hands up and 48 both of us in the kitchen
49 , he went upstairs to search the bedroom for 50 . I managed to teach my brother to untie the rope. He then united me. I 51 to the telephone to call the police， but the line was 52 . The doors were all locked from the outside .Luckily, the robber 53 to lock the kitchen window. My brother managed to get out of the house 54 the window.
My brother brought the police to our house and the robber was caught. The police 55 us for our good work.

D．questioning