將下列二進(jìn)制數(shù)轉(zhuǎn)換為十進(jìn)制數(shù),不用計(jì)算機(jī)器并寫出計(jì)算過程: A.(01101)2 B.(1011000)2 C.(011110.01)2 D.(111111.111)2