属于固定黏膜的是
A．唇颊黏膜 B．牙槽嵴黏膜 C．移形皱襞区黏膜 D．口腔黏膜 E．破溃黏膜
参考答案：B
—We really enjoy ourselves at the party.Thanks again,Mr.and Mrs.White.
—___________.Just drop in whenever you feel like it.
A．With pleasure
B．Our great honor
C．Nice having you here
D．Nice you are here
新氢压缩机开机前启动盘车器盘车（）分钟。
A、5
B、10
C、20
