基本医疗保险个人帐户基金的主要来源为（） A.个人缴费 B.国家财政注入 C.单位缴

若mn>0,则m,n（   ）

A．都为正

B．都为负

C．同号

D．异号

Though the “No smoking” signs have existed for long in public places, heavy smokers often ________ them and light up cigarettes.

A．abandon

B．postpone

C．decline

D．ignore

肺减容术治疗肺气肿通常对患者的年龄要求是（）

A.<60岁

B.<65岁

C.<70岁

D.<75岁

E.<80岁

Dear students,please read every sentence carefully.The more _________you are,the_________mistakes you'Il make,     [ ]

A. carefully; fewer        

B. careful; less      

C. careful; fewer

Which categories of NAVTEX messages may not be selectively rejected through receiver programming?（）

A.Navigational warnings

B.Weather warnings

C.SAR and distress alert information

D.All of the above