颡下颌关节成形术后开口练习应于何时开始
A.—般术后7~10天
B.—般术后1个月
C.—般术后3个月
D.一般术后半年
E.即刻
参考答案:A
We were suggested that we ____ attention to protecting wild animals.
A.pay
B.could pay
C.paid
D.must pay
隧道救援通道的宽度不宜小于()。