预防性树脂充填,错误的操作方法是
A.去净龋坏组织,作预防性扩展,备洞
B.清洁牙石、干燥、除湿
C.牙本质暴露时,需垫底
D.酸蚀
E.A型可见封闭剂充填
参考答案:A
You can never imagine the great difficulty I had _________ her QQ number.
A. to get B. getting C got D. not to get
秧苗在棚内2.5叶时,温度超过25度,本田易出现早穗现象。