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【单选题】
煮沸消毒时,为提高沸点,水中加入碳酸氢钠的浓度为A.
1％
B.
5％
C.
3％
D.
O.1％
E.
O.5％
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反馈参考答案：
举一反三
【简答题】设某平价债券的期限为5年，年利率为8%，面值为1000元，则该债券的期值为多少?
【简答题】设x、y、z为正实数，满足x-2y+3z=0，则 的最小值为多少？
【单选题】The word 'provided' in the second sentence of the 4th paragraph is closest in meaning to ______.
A.
supplied
B.
stipulated
C.
added
D.
suggested
【单选题】Pick the sentence that is punctuated correctly.
A.
"What are you going to dress up as," asked Matilda.
B.
"What are you going to dress up as?" asked Matilda.
C.
"What are you going to dress up as?asked Matilda.
【单选题】Pick the sentence that is punctuated correctly.
A.
"Let's go to the park." said Mark.
B.
"Let's go to the park," said Mark.
C.
"Let's go to the park" said Mark.
【单选题】关于心音描述错误的是
A.
第一心音发生于心缩期的开始，又称心缩音。其音调低，持续时间较长。
B.
第二心音发生于心舒期的开始，又称心舒音。其音调较高，但持续时间较短。
C.
第一心音产生的原因主要包括心室肌的收缩、房室瓣的关闭以及射血开始引起的主动脉管壁的振动。
D.
第二心音产生的原因主要包括半月瓣突然关闭、血液冲击瓣膜以及主动脉中血液减速等引起的振动。
E.
第一心音和第二心音同时发生，但间隔时间较长。
【单选题】Pick the sentence that is punctuated correctly.
A.
"I don't know about that," stated Lily.
B.
"I don't know about that, stated Lily."
C.
"I don't know about that," stated Lily."
【单选题】陶女士,35岁,持续高热,怀疑败血症。护士为其采集血培养标本,错误的操作是 检查容器有无裂缝
A.
检查容器有无裂缝
B.
检查培养基是否足够
C.
采集时严格执行无菌技术
D.
采血后即将针头插入培养瓶注入血液
E.
血液注入培养瓶内应轻轻摇匀
【简答题】当振荡脉冲频率为12 MHZ时,一个机器周期为 μs ;当振荡脉冲频率为6 MHz时,一个机器周期为 μs 。
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