工程变更是指工程施工过程中出现与（）时预计条件不一致的情况，而需要改变原定施工承包范

_______,but he still could not understand it.

A．He had been told many times

B．Having been told many times

C．Told many times

D．Although he had been told many times

⊙O中，直径AB=a，弦CD=b，则a与b大小为（　　）

A．a＞b

B．a≥b

C．a＜b

D．a≤b

随楔状缺损加深可出现的并发症除外

A．牙本质过敏症

B．可复性牙髓炎

C．牙龈 * * 炎

D．根尖周炎

E．牙齿折裂

—____ ?   —He is tall and thin．

A. What does your brother do

B. Hoe old is your brother

C. What does your brother look like

会计师事务所的准入条件，具有中级以上专业技术资格的应占（）以上。原则上要有5名以上注册资产评估师或注册会计师，至少不能低于3名。

A、20%

B、30%

C、40%

D、50%