空调的压缩冷凝器单元（CCU）主要包含（）、和（）。

Jimmy spent most of his time in the bedroom when he was in university. With his aunt’s help, the young man found a job in a park after his graduation. There’re all kinds of flowers in the gardens and he has to look after them. He thinks it’s easy and often stays in bed.

One morning the head of the park found some of the flowers were dead. He called Jimmy there and asked him the reason. The young man studied for a long time but couldn’t answer. Just at that moment an old gardener passed by and the head asked him for help. The old man studied it for a while and said,” A mole(鼹鼠)is eating their roots(根).”

“I don’t think it has something to do with the dead flowers,” said the young man, “People appreciate(欣赏)not the roots, but the flowers!”

1. What did Jimmy like doing when he was in university?

________________________________________________.

2. Where did he work?

__________________________________.

3. Did he work hard there?

____________________________________.

4. What made some of the flowers dead?

______________________________.

5. Who knew the answer?

______________________________.

在OutputStream类的常用方法中哪个是清空输出流的方法

A．fedcba

B．abcdef

C．afbecd

D．defabc

下列关于判决离婚时，子女抚养费金额判定原则的叙述中，错误的是( )。

A．有固定收入的，抚养费数目一般可按照收入的20%～30%确定。负担两个以上子女抚育的，比例可适当提高，但一般不得超过月收入的50%

B．无固定收入者可依当年的收入或同行业的年平均收入来确定抚养费数日，比例为 20%～30%

C．一般是以16周岁为底线，即具体数目是按月或年的抚养费的数额乘以将子女抚养至 16周岁为止的具体时间

D．在法院判决离婚涉及子女抚养费的，往往大多采用一次性给付方式，且被大部分当事人所接受

要把碳酸钠、氯化钠、硫酸、氢氧化钠、氢氧化钡五种无色溶液区别开，最少还需用其他试剂（　　）

A．0种

B．1种

C．2种

D．3种

三层PE夹克钢管可以是（）。

A、无缝钢管

B、直缝钢管

C、螺旋电焊钢管

D、铸铁管

E、镀锌钢管