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【单选题】
机械天平的一般结构主要包括外框、立柱、横梁和悬挂系统、光学读数系统、制动系统、机械加砝码装置及起码标尺等，其中（）是天平的主要部件，有天平心脏之称。A.
横梁
B.
立柱
C.
加码装置
D.
读数系统
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皮皮学刷刷变学霸
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【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。缓解此患者疼痛的方法不妥的是
A.
腹部按摩
B.
注射吗啡
C.
卧床休息
D.
注射阿托品
E.
注射哌替啶
【简答题】在单缝的夫琅禾费衍射中，若单缝处波阵面恰好分成4个半波带，如图所示。此时光线1与3是同位相的，光线2与4也是同位相的，为什么P点光强不是极大而是极小?
【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
【简答题】在单缝的夫琅禾费衍射中，若单缝处波阵面恰好分成4个半波带，如图22-2所示。此时光线1与3是同相位的，光线2与4也是同相位的，为什么P点光强不是极大而是极小?
【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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