混合支持式义齿的舌杆应()
A.与黏膜密合
B.离开0.5~1mm
C.离开1.5~2mm
D.离开2.5~3mm
E.离开3.5~4mm
参考答案:B
You can call Mr Li _____ you are in trouble inEngland.[ ]
A. before
B. after
C. when
D. because
依靠性传播的微生物有哪些?