我国照明用的交流电的电压是 _________ V,频率是_________Hz.
220;50
---Do you have any idea what Hawk does all day?
--- I know he spends at least as much time watching TV as he _______.
A.does writing
B.writes
C.is writing
D.spends on writing
子宫内膜异位的发生部位最多见于
A.卵巢
B.阔韧带
C.宫颈
D.输卵管