具有抗肿瘤作用的嘧啶类衍生物是（）
A．新诺明
B．白消安
C．长春新碱
D．沙奎那韦
E．阿糖胞苷
参考答案：E
解析：
阿糖胞苷为嘧啶类拮抗物抗肿瘤药。
钻孔时需用（）、螺栓或（）形定位元件等装夹工件，确保装夹牢固。
Questions 11 to 18 are based on the conversation you have just heard.
A．She hasn’t talked with the new manager yet.
B．The new manager was not in the office.
C．She has been at home.
D．She didn’t want to talk with the new manager.
