【单选题】下列CSS代码中,能实现上图中的圆角边框的是( )
B.
border-radius:20px 0 0 20px;
C.
border-radius:0 20px 0 20px;
D.
border-radius:20px 0 20px 0;
【单选题】用高率放电计检查汽车铅蓄电池的放电程度,当蓄电池放电达50%时,其单格电压应在()范围内。
【简答题】四、 挑出下列句中的宾语 My brother hasn't done his homework.
【简答题】指出该句中的宾语 My brother hasn't done his homework.
【单选题】因特网中PCP/IP协议的IP协议指的是( ).
【简答题】挑出下列句中的宾语 My brother hasn't done his homework.