－－－ ________________？－－－ Two years ago.A. Where did he goB. When did he go to AmericaC.

Wouldn’t you rather your child _________________ t

已知波动方程为s=10sin（2πt－0．1x) m，则此波的波速为________；t=T／2时，波源的振动速度为________。

－－－－ ______________________________－－－－ Yeah. It is the only professional museum about t

— Thank you for your delicious dinner.— ___________________.A、Don’t say that.B、I don’t t

T细胞活化的第二信号主要是由APC表面______分子与T细胞表面______分子结合相互作用产生

Don’t forget ________ the window before leaving t