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【单选题】
如图所示，圆形截面时最大正应力为σ a ，把该梁换成横截面积相同的矩形截面，截面的高度大于宽度，其他条件不变，此时最大正应力为σ b ，则σ a 与σ b 的关系为（）。A.
σ a ＞σ b
B.
σ a ＜σ b
C.
σ a =σ b
D.
无法比较
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举一反三
【简答题】在短周期元素中:原子核外电子总数是其最外层电子数 2 倍的元素是 ____,原子电子层数和核外最外层电子数相等的元素是 ____,最外层电子数为电子层 2 倍的元素是____.
【简答题】Thomas Edison could never be happy only because someone said he was a genius. "There is no such thing as genius," Edison said, He said that what people called genius was mostly hard work. From his ear...
【单选题】What was the one thing Bill said he enjoyed? 查看材料
A.
His friends' company．
B.
Supporting his team．
C.
Eating some food．
【单选题】听力原文：M: Charles enjoyed his two-week drive through South China. W: Yes, he said that he saw much more than he would have travelling by bus or train. How did Charles travel?
A.
By car.
B.
By plane.
C.
By bus.
D.
By train.
【单选题】患者男性,21岁,因突发剑突下钻顶样剧烈疼痛而入院,自诉疼痛呈间歇性,发作时疼痛剧烈,辗转不安,大汗淋漓,可突然自行缓解,缓解期无任何症状。体检示剑突下有轻度深压痛。WBC11.5×109/L。.血常规检查可见
A.
嗜碱性粒细胞比例升高
B.
嗜酸性粒细胞比例升高
C.
中性粒细胞比例升高
D.
淋巴细胞升高
E.
血小板升高
【单选题】—He said he enjoyed the quiet life of the country. —__________ and __________ .
A.
So did he; so did I
B.
So he did; so did I
C.
He did so; I did so
D.
Did he so; so I did
【单选题】听力原文：M: Charles enjoyed his two -week drive through South China. W: Yes, he said that he saw much more than he would have traveling by bus or train. Q: How did Charles travel? (19)
A.
By ear.
B.
By bus.
C.
By place.
D.
By train.
【单选题】患者,男性,21岁,因突发剑突下钻顶样剧烈疼痛而入院。自诉疼痛呈间歇性,发作时疼痛剧烈,但可突然自行缓解,缓解后无任何症状。首选的检查方法是
A.
血常规
B.
B超
C.
腹部平片
D.
CT
E.
腹腔穿刺
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