【单选题】News item 3
A.
Give antiretroviral drugs to fathers and mothers.
B.
Give anti-infective drugs to fathers and babies.
C.
Give antiretroviral drugs to mothers and babies.
D.
Give anti-infective drugs to babies alone.
【单选题】将PN结P区接电源正极,N区接电源负极,此时PN结处于( )偏置。
【判断题】所谓 PN 结单向导电性是指:当 P 区接电源负极, N 区接电源正极, PN 结呈低阻导通状态;当 P 区接电源正极, N 区接电源负极, PN 结呈高阻截止状态。
【单选题】将 PN 结 P 区接电源负极, N 区按电源正极,此时 PN 结处于 ( ) 偏置。
【单选题】News item 3
A.
Farms in New York and Canada
B.
A restaurant in California