紫铜钨极氩弧焊当壁厚大于3mm时,焊前应对坡口两侧150mm范围内进行均匀预热,预热

题型:单项选择题

问题:

紫铜钨极氩弧焊当壁厚大于3mm时,焊前应对坡口两侧150mm范围内进行均匀预热,预热温度应为()。

A、50~100℃

B、150~200℃

C、350~550℃

D、700~900℃

考点:焊工技能考试焊工技能考试题库
题型:单项选择题

Steven Jobs was born in 1955. He was an American businessman and inventor. He was the co-founder and chief executive officer (CEO) of Apple Inc. In the late 1970s, Steve, with Apple co-founder Steve Wozniak, Mike Markkula, and others, designed, developed, and marketed one of the first successful lines of personal computers, the Apple II series and later, the Macintosh.

Steve was among the greatest of American inventors – brave enough to think differently, and believed he could change the world and in fact, he had the power to change the whole world. By making computers personal and putting the Internet in our pockets, he has brought joy to millions of children and grownups.

Steve was fond of saying that he lived every day like it was his last. He changed the way each of us sees the world. Steve’s brilliance, passion and energy were the source of countless innovations that enrich and improve all of our lives. The world is much better because of Steve. On October 5, 2011, Steve died of cancer. The world has lost a visionary. We all feel sad about it.

小题1:Where can we find this passage?

A.In a science book.

B.In a science fiction novel.

C.In a dictionary.

D.In a newspaper.小题2:Why Steve was fond of saying that he lived every day like it was his last?

A.Because he knew he would die soon.

B.Because he was too busy every day.

C.Because he was humorous.

D.Because he wanted to make full use of time.小题3:From the passage, we can know that ______.

A.It is cancer that took the Steve’s life

B.Steve’s brilliance, passion and energy enrich and improve all of our lives

C.Apple II series and the Macintosh have made computers personal and put the Internet in our pockets

D.Steve was a businessman but not an inventor小题4:According to the passage, “a visionary” means ______.

A.一位伟人

B.一位见证者

C.一位梦想家

D.一位冒险家小题5:What would be the best title for this passage?

A.Steve Jobs’ death

B.Our loss of a great CEO

C.A great inventor, Steve Jobs

D.The great changes in our lives

题型:单项选择题

捻发音多发生在呼吸的哪个时期

A.吸气早期

B.吸气中期

C.吸气末期

D.呼气中期

E.呼气晚期

题型:单项选择题

患者,男性,52岁,近期反复牙龈出血。查:患者面色灰暗,颈部及胸部有蜘蛛痣,血红蛋白75g/L,白细胞4.0×109/L,血小板60×109/L,肝功能ALT38U,白蛋白34g/L,球蛋白37g/L。估计患者牙龈出血原因最可能是()。

A.凝血因子破坏

B.造血功能障碍

C.血小板低

D.药物不良反应

E.肝硬化

题型:单项选择题

我国绝大多数的矿井的采煤工作面采用上行通风。

题型:单项选择题

下列哪一项()没有违反诚实守信的要求。

A.派人打进竞争对手内部,增强竞争优势

B.是否诚实守信要视具体对象而定

C.凡有利益于企业的行为

D.保守企业秘密

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