某一液体，放入带压容器，当压力为P1＞P2时，液体沸点（）。
A.t1＜t2
B.t1＞t2
C.t1=t2
D.t1≤t2
参考答案：B
My teacher used to _______ a bike to school, but now he is used to ________ a car to work.
A．ride, driving
B．ride, drive
C．riding, drive
D．riding, driving
绞釉位于釉质（）
A.近表面1/3
B.近表面2/3
C.近釉质牙本质界1／2
D.近釉质牙本质界2／3
E.近釉质牙本质界1／3
