配料矿槽的作用是什么？

完形填空。

It's lunch time. You're hungry and want to getyour favourite meal in the restaurant, but there are aqueue of people nearly reaching the door. Don't  1  In cyberworld (网络世界), you can get your meal just    2   a few clicks.      "  3   has never been so easy.With just a single click on our mouse, anything that you orderonline can be taken to your door in no time," said BianJing   4   is twenty years old. She took part in an online survival(生存)competition held inBeijing.Each competitor had to go online and buy enough food and drink to last them for 100 hours using the little money given.      "I don't want to spend   5   time shopping so I do it on Line rather than in an ordinary store,"said a girl from a middle school. "   6  easy to find the things you want online as they have catalogues (目录). "     Shoppers who go online can also find lower prices and wider choices of things they want to buy.But many teachers and parents are worried that online shopping is becoming too popular.      "It's not a good way for middle school students   7   their money," said a teacher.      "I don't like them to shop,online." As all the students' money is from their parents, it's said that they aren't ready to  8    what they have bought online. "There   9    the danger that they'll lose the money at online stores that just want to cheat (欺骗) shoppers,"one of tlie teachers said.      Most parents, though , don't want to pay the bills when their children spend too much on the Internet. "I hate having to. pay unexpected bills,"said one father.      "But my son always   10   me with them."

( )1. A. be afraid   ( )2. A. for         ( )3. A. Shop       ( )4. A. which       ( )5. A. too many   ( )6. A. That's     ( )7. A. to spend   ( )8. A. pay         ( )9. A. are also   ( )10. A. surprises B. in         B. in         B. Shopping   B. whom       B. many too   B. It's       B. to pay     B. pay for     B. also are   B. surprising C. be worry C. on       C. oshopping C. who       C. too much C. It       C. to take   C. spend on C. also is   C. surprise D. worry     D. with     D. Shops     D. she                            D. much too D. That     D. too cost D. spend     D. is also   D. surprised

注册会计师在确定应收账款函证对象时应当函证的项目有( )。

A．应收纳入审计范围内的公司的款项
B．执行其他审计程序可以确认的应收账款
C．函证很可能无效的应收款项
D．交易频繁但期末余额较小的应收账款

现有部分常见元素的性质或原子结构如下表：

元素符号	元素性质或原子结构
X	由它形成得某种单质气体的密度约为空气的1.1倍
Y	历史上道尔顿曾用⊙来作为它的元素符号，它的单质是最轻的气体
Z	由它组成的某种单质是细鳞片状的很软的固体，有金属光泽和滑腻感

（1）元素X和Y能形成原子个数比为1：1的化合物，其化学式为______．

（2）写成元素Z组成的这种单质的一种用途______．

不锈钢汇管连接的缺点是（）。

A、安全性低

B、投资高

C、调整不灵活

D、安装不固定

下列试验项目属于带电作业的是（）。

A.测量运行中的氧化锌避雷器电流

B.测量电压互感器的空载电流

C.检测运行中的线路绝缘子

D.测量杆塔接地电阻