硅铁浇注中应注意什么？

A man has got an old cat and a young cat. He likes them very much. A friend comes to see him and finds two holes(洞) in his door. One is big, the other is small.

“My dear friend”, he says, “why are there two holes in your door?”

“To let the cats in and out, of course.” The man says.

“But why are there two holes? I think one hole is OK.”

“How can the big cat go through（通过） the small hole?” says the man.

“That’s all right, but can’t the small cat go through the big hole?”

请根据短文内容，判断下面的句子意思是否符合原文，相符写T，不符写F。

小题1:The man has got a dog and a cat.

小题2: His friend comes to see the cats.

小题3:The two holes are for the man and the cats.

小题4: The two cats can go through the big hole.

小题5: The two cats are old.

男性，50岁。涕中带血丝1个月余，无发热及咽部肿痛。CT检查见图所示，应首先怀疑以下何种疾病()

A．鼻咽癌

B．咽旁脓肿

C．咽部淋巴结炎

D．喉癌

E．神经纤维瘤

颅中窝径路适用于()

A.迷路段及内听道段面神经减压术

B.岩尖部胆脂瘤清除术

C.前庭神经切断术

D.直径小于1cm的听神经瘤切除

E.以上都对

（3-4题共用题干）　　患者一侧后牙食物嵌塞，嵌塞后引起剧烈疼痛，持续数秒，要求治疗。查：6°龋（是合面龋），探敏，叩（一），冷测敏感，不持续热则同对照牙

该牙诊断应为

A．中龋

B．深龋

C．牙髓充血

D．慢性牙髓炎

E．牙本质敏感症

A．条件(1)充分，但条件(2)不充分．
B．条件(2)充分，但条件(1)不充分．
C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D．条件(1)充分，条件(2)也充分．
E．条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

方程4x²+(a-2)x+a-5=0有两个不等的负实根．
(1) a＜6 (2) a＞5