吊钩发生落地事故的原因有哪些?

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问题:

吊钩发生落地事故的原因有哪些?

考点:起重机操作证考试桥门式起重机司机桥门式起重机司机题库
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Jack London is a famous American writer. His most widely known book is the Call of the Wild, the story of the adventure of a large dog in the frozen north.

Jack London was born on January 12, 1876, in San Francisco, California. His family was very poor, and Jack had to leave school to make money. He worked hard at many different jobs.

Later, Jack returned to school, but he didn’t stay. He wrote, “Life and pocket book were both too short.” In 1897, he went to Alaska to find gold. Instead, he found ideas there for his book stories. He returned home and started to write. His writings were successful, and he became rich and famous in his twenties.

Jack London was not a happy man, however. In poor health, he took his own life in 1916. He was then only 40 years old.

小题1: Jack London went to Alaska to __________________.

A.find ideas for his books

B.find gold

C.write his books and stories

D.find jobs小题2: Jack London left school because __________________.

A.he had to work to help his family

B.he had completed his education

C.he wanted to become a writer

D.he wanted to find gold.小题3: From what did Jack London get ideas for his books and stories?

A.His life in Alaska.

B.His childhood friend.

C.A large dog in the north.

D.His pocket book.小题4:What do we know about Jack London?

A.He became famous but remained poor all his life.

B.Though he was poor, he was always happy.

C.He was not famous until he died in 1916.

D.He killed himself because of poor health.

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下列有关鼓膜的描述正确的有()

A.位于外耳道的底部

B.与外耳道下壁呈45°角倾斜

C.鼓膜后下部有光锥

D.鼓膜上1/4部为松弛部

E.鼓膜的中央略向外凹陷,称鼓膜脐

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在订阅电子合同的情况下,经营者应当向消费者告辞以下情况:()

A、订立合同的各项步骤 

B、合同订立后是否存在档案以及是否可以查阅 

C、服务供应商设立的地址

D、修正人为错误的方法

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夏某于2009年10月1日从金星商场购买了一台电冰箱,10月10日在使用过程中因产品质量问题身体受到伤害,根据我国《民事诉讼法》的规定,夏某有权向人民法院提起诉讼的期间为( )。

A.2009年10月1日至2010年9月30日
B.2009年10月1日至2011年9月30日
C.2009年10月10日至2010年10月9日
D.2009年10月10日至2011年10月9日

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开钻前是否需要进行地质交底?

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