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①若f(x)=,則f(x)在x=-1處連續(xù)   

②若則f(x)·g(x)在x=0處連續(xù)   

③若f(x)=則f(x)在x=1處連續(xù)   

④若f(x)·g(x)在x=x₀處連續(xù),則f(x)和g(x)在x=x₀處連續(xù)

A.0                  B.1                   C.2                    D.3

A.連續(xù)                B.不連續(xù)             C.無(wú)法確定             D.以上都不正確

A.f(x)在點(diǎn)x=0處不連續(xù),在點(diǎn)x=1處連續(xù)

B.f(x)在點(diǎn)x=0處連續(xù),在點(diǎn)x=1處不連續(xù)

C.f(x)在點(diǎn)x=0和x=1處都連續(xù)

D.f(x)在點(diǎn)x=0和x=1處都不連續(xù)

A.32               B.23                  C.1                   D.0

A.1                 B.2                  C.3                   D.4

A.3                   B.-3                 C.±3                 D.不存在

A.連續(xù)點(diǎn)                                      B.無(wú)定義的點(diǎn)

C.不連續(xù)的點(diǎn)                               D.極限不存在的點(diǎn)

A.x=0                                      

B.x=(k=0,±1,±2,…)

C.x=0和x=2kπ(k=0,±1,±2,…)               

D.x=0和x=(k=0,±1,±2,…)

A.無(wú)極限               B.不連續(xù)             C.連續(xù)無(wú)極限          D.不連續(xù)有極限

A.充分不必要條件                            B.必要不充分條件

C.充要條件                                     D.既不充分也不必要條件