某企业采用融资租赁的方式于2005年1月1日融资租入一台设备，设备价款为60000元

根据中文提示或用所给词的适当形式填空。

1. There are _____ (十四) classes in our grade.

2. He is tall and _____ (强壮的)while his sister is small.

3. Peter, where can we buy some _____ (礼物) for our teachers?

4. October is my _____ (特别喜爱的) month.

5. It's important to look at the _____ (黑板) and listen to our teacher carefully.

6. Our classroom is big and clean, but _____ (they) is very dirty.

7. Lily and Lucy are twin _____ (sister).

8. When I have time, I always go _____ (shop) with my good friends.

9. It's Simon's _____ (one) day at Beijing Sunshine Secondary School.

10. Daniel's mother is a worker and his father is a _____ (drive).

下列哪项是最常用的急性毒性指标

A．绝对致死剂量(或浓度)

B．半数致死剂量(或浓度)

C．最低致死剂量(或浓度)

D．最大耐受剂量(或浓度)

E．急性毒作用带

A．50%

B．60%

C．70%

D．80%

Wits距表示（）

A.上下中切牙切端的距离

B.上中切牙切端到上下齿槽座点连线的距离

C.上下齿槽座点在功能平面上的投影点之间的距离

D.上中切牙切端到腭平面（前后鼻棘连线）的距离

E.上中切牙切端到NA连线延长线的距离

男，70岁。戴下颌活动义齿半年，昨日咬物时折断。查：黏膜支托式可摘局部义齿，三处舌侧基托纵折，两断端约 1.5mm厚，咬合接触良好。造成基托折断的原因是（）

A．基托过薄

B．咬过硬食物

C．习惯单侧咀嚼

D．取戴义齿方法不正确

E．牙槽嵴吸收，现基托与组织不密合