关于合同变更的效力的说法中，不正确的是（）。 A.合同的变更是在保持原合同关系的基础

影响责任恢复保险费的计算因素是（）。

A.损失持续时间

B.最后净损失

C.原有保险费

D.一次事故

情景对话

根据对话情景和内容，从对话后所给的选项中选出能填人每一空白处的最佳选项，选项中有两个为多余选项。

Repairman: Good afternoon.     1    

Customer:  Hello. My mobile phone isn't working. Could you repair, please?

Repairman:      2            

Customer: It worked well yesterday, but I simply couldn't turn it on this morning.

Repairman:      3     

Customer: Here you are.

Repairman: Well,I think we,11 be able to fix it. You can pick it up this Friday.

Customer: Oh, no. That's too long.        4       I need it as soon as possible.

Repairman:         5       what time?

Customer: Let me see. How about Wednesday afternoon?

Repairman: After five o'clock

Customer: Ok. Thank you.

A. That's great.

B. I beg your pardon?

C. Let me have a look.

D. What's the problem?

E. Pm sorry to hear that.

F. What can I do for you?

G. I wonder if you could fix it earlier.

为促使凝集现象的出现，下列措施中哪项是错误的（）

A.离心使复合物沉淀

B.降低试剂的黏滞度

C.用胰酶或神经氨酸酶处理

D.适合pH

E.电解质含量适当

男性，65岁，3年来右腹股沟部可复性肿物，站位即突出，平卧消失，突出时有下坠不适感，肿物有增大趋势。既往有前列腺增生5年，半年前已手术治疗。

该患者查体及手术中所见，哪项是错误的

A．肿物外观呈半球形，不进入阴囊

B．肿物还纳后，压住内环，肿物仍可出现

C．疝囊在精索内后方

D．腹壁下动脉在疝囊颈内侧

海相沉积铁矿床形成于何种沉积环境？