护士在与患者第一次接触时，应采用的距离是（） A.个人距离 B.亲密距离 C.社会距

常温下，向20 L的真空容器中通入a mol H₂S和b mol SO₂（a和b都是正整数，且a≤5，b≤5）。反应完全后，容器内气体可能达到的最大密度是（ ）

A．24.5 g/L

B．14.4 g/L

C．8 g/L

D．5.19 g/L

含有联苯环辛烯型木脂素成分的是( )

A．五味子

B．厚朴

C．补骨脂

D．秦皮

E．鬼臼

Warm water freezes more quickly than cold water. Sir Francis Bacon said that almost four hundred years ago. But few people believed him. Later, a Canadian scientist George Kell proved the English scholar was right. Dr.Kell filled an open jar（罐子）with cold water. He filled another with warm water. He put them both in the same low temperature. And the warm water froze first.

What was the reason? Some of the warm water changed into vapour. It went into the air. This meant that less of the warm water was left to freeze. And so the warm water froze faster than the cold water.

小题1: Sir Francis Bacon was__________________.

A．an American chemist

B．an English scholar

C．a Canadian scientist

D．a French physicist小题2: Dr.Kell’s jars were both_____________________.

A．put in a place of the same low temperature

B．filled with warm water

C．left empty

D．put on a long table小题3: The cold water froze more slowly because_____________.

A．there was less of it left

B．there was more of it left

C．something else was added to it

D．its jar was much bigger小题4: Dr.Kell proved what Bacon said in _____________ way.

A．a difficult

B．a hard

C．a wrong

D．a simple

糖尿病孕妇娩出的新生儿易发生

A．体重大于4000g

B．低血糖

C．高胆红素血症

D．感染

E．低血钙

中、低比转数离心泵、其机械损失中（）的摩擦损失主要成分

A、轴与轴封处

B、轴与轴承处

C、叶轮圆盘

D、A+B