A:经常
B:从不
C:偶尔
用托盘天平称量一个小烧杯的质量,可能的准确读数是()
如图,PA、PB分别切⊙O于A、B,并与⊙O的另一条切线分别相交于D、C两点,已知PA=6,则△PCD的周长=____
— I wonder if this smart phone is Mary's.— It _______ belong to her. _______ is totally different from this one.
— How is the weather?
—