库肯勃瘤是（） A.良性卵巢肿瘤 B.原发于胃肠道卵巢转移性肿瘤 C.囊性肿瘤 D.

物体由A到B做单一方向的匀变速直线运动，所用时间为 t，设t时间中点时刻的速度为v₁，物体在AB位移中点时的速度为v₂，则（　　）

A．v₁＞v₂

B．v₁＜v₂

C．v₁=v₂

D．不能确定v₁和v₂的大小关系

关系式x≤-5或x≥5所对应的布尔表达式是 【7】 。

--Could you tell me __________?

-- No. Let’s go and have a look. Maybe someone is hurt, and we can help him.

A．what was happened there

B．when they are doing there

C．what is going on there

D．what they were going on there

生化汤与桃红四物汤都有的药物是

A．当归

B．甘草

C．川芎

D．桃仁

E．芍药

Я видел,как ты разговаривал ( с кем-н, кое с кем)