平板仪测图时,由于图板定向不准确,所引起各碎部点的位置误差属于()。
(A)偶然误差;
(B)系统误差;
(C)粗差;
(D)视差。
参考答案:B
Complete the sentences with the proper forms of the given verbs. (10’)
1. Since the accident ___________ (happen), he ___________ (be) afraid of ________ (drive) alone.
2. I don’t mean ___________ (disrespect) you, but I think there’s a mistake in your speech.
3. I met Alan the other day in the mall, but he pretended ___________ (not see) me.
4. He spends almost an hour ___________ (take) the bus to work. That’s why he is considering ___________ (buy) a car.
5. He had to brake hard to avoid ___________ (hit) the dog.
6. –Will you go to Winnie’s Wedding party? –If Emmy ___________ (not go), neither ___________ I.
某建筑工地进行主体施工,搭设脚手架外侧未挂设密目式安全网,当日风很大,张某从楼底下经过,突然从五楼楼板边缘处掉下一块lm长4cm×6cm的方木,正好击中张某头部(未戴安全帽),经送医院抢救无效死亡。请判断下列事故原因分析的对错。
张某违章未戴安全帽。