为保证浮子式钢带液位计钢带张紧，绕过钉轮的钢带由收紧轮收紧，其收紧力由（）提供。（A

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Encouraging your high school student to do his/her best isn’t as hard as you may think. It does take time and effort, but it should become part of a daily routine that both you and your teen can enjoy more than dread （担忧）. Here are some tips that can help you.

1.   1   Know what classes he/she is taking, what your teen thinks of the teacher and/or ask if your teen feels he/she is learning anything. This is excellent dinner table conversation if you can keep it light and positive.

2. Set the expectations.   2   You would not do your teen any favors by not telling him/her what grades you will be expecting. Send a clear message to your teen about the grades you expect to see in each class.   3   Keep your expectations in line with what your teen feels he/she can do.

3.   4   While your teen will need to keep his/her goals in line with your expectations, he/she may have a goal that he/she feels is important too. Learning to establish goals teaches independence, one of the things your teen needs to learn to become a successful adult.

4. Have what they need at home, or a way to get it.   5  Your family should have library cards and a way to access the Internet for homework. Without these things, your teen could be at a disadvantage. It is also a good idea to set up a mobile homework center.

Finally, don’t forget to praise your teen for a job well done.

A．Help him/her establish goals.

B．Talk to your teen about school.

C．Learning in a classroom is a two-way street.

D．Resources are important for high school students.E. Teens need a clear map of what you want them to do.

F. Set a good example and show him/her your love of learning.

G. Set consequences for poor grades as well as rewards for good grades.

下述哪项不是三叉神经痛的发作特点（）。

A.发作前常无先兆

B.骤然闪电

C.持续钝痛

D.二次发作期间完全无痛

E.半数以上有“扳机点”

代谢产物为活性代谢物，并已作为药品使用的是（）

A．盐酸吗啡

B．盐酸哌替啶

C．枸橼酸芬太尼

D．盐酸美沙酮

E．盐酸溴己新

小蜜蜂公司是一家从事零售业务的商品流通企业，采用零售价格法计算商品销售成本和期末库存商品成本。2008年5月份该公司发生如下业务：
1日，库存商品的进价成本为100000元，售价总额为120000元。
10日，从某生产厂家购进一批商品，货款共计200000元，验收时发现质量不符合要求，与对方联系后，对方同意给予10%的购货折让。该批商品的售价总额为230000元。5月份的销售收入总额为320000元。
31日，实地盘点库存商品时发现，商品盘亏损失1000元，系管理不善造成。经公司经理会议讨论决定，由仓库保管员赔偿400元，其余损失由公司承担。

小蜜蜂公司10日购进的商品的采购成本为( )元。

A．180000

B．200000

C．207000

D．230000