双锥回转真空干燥机开车前应做哪些检查？

阅读短文，按要求完成短文后的各项任务。（本大题共5小题，满分10分）

There are many advantages and disadvantages for being a musician.

The biggest advantage is being able to do something you love. (1)You will have the        chance to travel to many different ______ and meet a lot of different ______. That will open up your eyes.

However, there are also disadvantages of being a professional(专业的) musician. (2)One of the biggest disadvantages for most musicians is that they don’t always have enough money. Most of the time, you will be looking for jobs. Sometimes you won’t be able to find a good job easily. Another disadvantage is the place you live in. If you want to be a musician, you usually have to move to an area that has a lot of jobs, such as New York City. The cost of living in these areas is usually very high. The third disadvantage is that you can’t have a stable（稳定的） family life. Different jobs will take a musician to different places, so most musicians are unable to have a regular family.

小题1:在(1) 空白处分别填入一个适当的词使句意完整、上下文通顺。

小题2:将(2)处的英文翻译成中文

小题3:在文中找出与It’s difficult for some musicians to find a good job sometimes.的同义句：

小题4:回答问题：How many disadvantages for being a musician are there in this text?

小题5:写出文中最能表达该短文主题的句子。

( 13分)西瓜膨大剂别名氯吡苯脲，是经过国家批准的植物生长调节剂，实践证明长期使用对人体无害。已知其相关性质如下表所示：

分子式	结构简式	外观	熔点	溶解性
C12H10ClN3O		白色结晶粉末	170~172°C	易溶于水

（1）氯元素基态原子核外电子的未成对电子数为         。

（2）氯吡苯脲的晶体类型为_______        ，所含第二周期元素第一电离能从大到小的顺序为________________。

（3）氯吡苯脲晶体中，氮原子的杂化轨道类型为______    _。

（4）氯吡苯脲晶体中，微粒间的作用力类型有________    _。

A．离子键B．金属键C．共价键D．配位键E．氢键

（5）氯吡苯脲熔点低，易溶于水的原因分别为_________________________________

________________________________________________________________________。

（6）查文献可知，可用2-氯-4-氨基吡啶与异氰酸苯酯反应，生成氯吡苯脲。

异氰酸苯酯                 2-氯-4-氨基吡啶               氯吡苯脲

反应过程中，每生成1mol氯吡苯脲,断裂_______个σ键、断裂_______个π键

某加工企业与运输签订货物运输合同，合同载明货物价值500万元，运输费用65万元 (含装卸费5万元)；与某保险公司签订一年期保险合同，合同载明为本企业的固定资产上财产保险，每年支付保险费20万元。该加工企业应缴纳印花税( )元。

A．450

B．500

C．455

D．550

IP分组头中的标识符字段能够（）

A．使分段后的数据包按顺序重装配

B．标识不同的上层协议

C．控制数据包在网络中的旅行时间

D．控制分段的长度

我们平常所说的重量单位1两转换成国际单位是100g。