(A)arcsin           

(B)arccos          

(C)arcsin           

(D)arccos

(A)2⁸                                               

(B)3⁸                                 

(C)1或3⁸                   

(D)1或2⁸

(A)                     

(B)                     

(C)                    

(D)

①若mα,n∥α,则m∥n；

②若m∥α,m∥β,则α∥β；

③若α∩β=n,m∥n,则m∥α且m∥β；

④若m⊥α,m⊥β,则α∥β.

其中真命题的个数是…………………………………………………(　　)

(A)0                        

(B)1                        

(C)2                        

(D)3

(A)1                        

(B)－1              

(C)2                        

(D)

(A)                   

(B)                   

(C)                   

(D)

命题q:函数y=的定义域是(－∞,－1］∪［3,+∞).则……(　　)

(A)“p或q”为假                            

(B)“p且q”为真

(C)p真q假                                         

(D)p假q真

(A)2                        

(B)2+          

(C)4                        

(D)

(A){1,2,4}               

(B){4}              

(C){3,5}                  

(D)