在同一界面上,声强反射率R与声强透过率T之间的关系是()
A、R+T=1
B、T=1-R
C、R=1-T
D、以上全部
参考答案:D
On returning home from school, Xiao Hong______ her MP4 and threw herself down onto the bed, ______ music.
A.put on; listening to
B.put on; listened to
C.left out; listened to
D.left out; listening to
中国证券登记结算有限责任公司是( )的法人。
A.风险自负的营利性 B.不以营利为目的C.由证券交易所管 D.经财政部批准设立