标准麻花钻的锋角为()。A、118°; B、35°~40°; C、50°~55°

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问题:

标准麻花钻的锋角为()。

A、118°;

B、35°~40°;

C、50°~55°

考点:数控机床操作工考试数控机床操作工考试题库
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甲类传染病是指()

A.SARS、狂犬病

B.黑热病、炭疽

C.高致病性禽流感、天花

D.鼠疫、霍乱

E.伤寒、流行性出血热

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在总压101.33kPa下,湿度0.01kg/(kg绝干气)、温度150℃的湿空气在理想干燥器中降温至60℃时离开,出干燥器的废气的湿度最接近( )。

A.456kg/(kg绝干气)

B.476kg/(kg绝干气)

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以下关于网络利用率的叙述中,错误的是()

A.利用率与吞吐量大小有关

B.利用率足描述效率的指标

C.利用率与负载大小有关

D.利用率是描述服务性能的指标

题型:单项选择题

"I would almost rather see you dead." Robert S. Cassatt, a leading banker of Philadelphia, shouted when his twenty-year-old eldest daughter announced that she wanted to become an artist.
In the 19th century, playing at drawing or painting on dishes was all right for a young lady, but serious work in art was not. And when the young lady’s family ranked among the best of Philadelphia’s social families, such an idea could not even be considered.
That was how Mary Cassatt, born in 1844, began her straggle as an artist. She did not tremble before her father’s anger. Instead; she opposed him with courage and at last made him change his mind. Mary Cassatt gave up her social position and all thought of a husband and a family, which in those times was unthinkable for a young lady. In the end, after long years of hard work and perseverance, she became America’s most important woman artist and the internationally recognized leading woman painter of the time.

According to the text, which was most important for a U.S. woman in Mary Cassatt’s time
[A] Money [B] Courage.[C] Marriage.

题型:单项选择题

多用途滤毒罐用于一定浓度的有害气体场所,氧气含量不低于()%的情况下使用,尤其适用与进入狭小和通风条件不好的空间。

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