货物列车在车站停留超过（）时，车站值班员应在不少于开车前5min预告该列车“xx（次

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       Harry goes out after lunch.  He goes in the tree house.  But he can't find his football. He's sure Nick takes it away.  He doesn't know where they are playing. He comes down and begins to play with his dog Bobby.  His father comes out, with a bag in his hand.

        "Where are you going, Daddy?" asks the boy.

        "Mr.  Hill is ill," says his father.  "I'm going to see him. "

    .   Mr.  Hill has a nice garden.  There are all kinds of flowers in it.  And the boy likes to pick some there.  So he asks his father to take him there.  Half an hour later, their car stops at Mr.  Hill's gatc and an old man opens the door for them.

       Mr.  Hill is in bed.  Harry says hello to him and then comes out.  Rose, the little daughter of Mr.  Hill's, brings him to the garden and picks (摘) some flowers for him.  The boy is happy and thanks the little girl.

       "Do you feel like a cup of coffee, Harry?-  asks Rose.

       "Look at me,carcfully," says the boy.  "Do I look like one?"

1. Harry goes out in the _________.

2. Mr.  Hill is ill.  So Harry's father wants to_________Mr.  Hill.

3. Harry goes to Mr.  Hill's to get some_________.

4. Harry and his father go to Mr.  Hill's by_________.

5. _________knows Harry likes flowers and picks some for him.

通过加入何种试剂可使季铵型水溶性生物碱生成水不溶性的盐类等沉淀析出而与水溶性杂质分离

A．钙盐

B．钡盐

C．雷氏铵盐

D．铅盐

E．铵盐

【选修3-3选做题】

喷雾器内有10L水，上部封闭有l atm的空气2L。关闭喷雾阀门，用打气筒向喷雾器内再充入1 atm的空气3L（设外界环境温度一定，空气可看作理想气体）。

（1）当水面上方气体温度与外界温度相等时，求气体压强，并从微观上解释气体压强变化的原因。

（2）打开喷雾阀门，喷雾过程中封闭气体可以看成等温膨胀，此过程气体是吸热还是放热？简要说明理由。

下列物质中不能与Tollen试剂反应的是( )。

A．对苯二酚

B．甲酸

C．甲醛

D．水杨醛

下列项目中，不属于政府补助的是( )。

A．财政拨款
B．财政贴息
C．无偿划拔非货币性资产
D．出口退税