形成渐开线的的圆称为齿轮的（）。A.齿根圆； B.基圆； C.节圆； D.分度圆。

W: Did you watch the 7 o’clock program on channel 2 yesterday evening I was about to watch it when someone came to see me.
M: Yeah! It reported some major breakthrough (突破) in cancer research. People over 40 would find the program worth watching.
Q: What do we learn from the conversation about the TV program().

A. It could help people of all ages to avoid cancer.

B. It was mainly meant for cancer patients.

C. It might appeal more to viewers over 40.

D. It was frequently interrupted by commercials.

对结核性腹膜炎腹部症状的描述，错误的是（）

A.早期腹痛明显

B.腹痛多在脐周、下腹

C.多为持续性隐痛或钝痛

D.可有阵发性绞痛

E.偶可表现为急腹症

我国的海洋环境问题主要是（）已经受到不同程度的污染损害，沿海河口地区和城市附近海域污染严重。

A.近岸水质

B.近海海域水质

C.毗连区海域水质

D.大陆架海域水质

脊髓亚急性联合变性的临床特点是（）

A.多为中年发病，亚急性或慢性起病

B.常伴贫血或胃肠道疾病

C.常见深感觉障碍、感觉性共济失调及手套袜套型感觉障碍

D.可见锥体束征，下肢常重于上肢

E.括约肌功能障碍较早出现

明煅法