用有刻度的牙周探针探测牙周袋时应注意下列几点,除了()。
A.支点应稳
B.探测力量应掌握恰当
C.探测宽度要角度垂直
D.探测位置和角度要恰当
E.按顺序探测
参考答案:C
____ Lucy ___ Lily may go to the concert with you. Because they are not allowed to go out on school nights. [ ]
A. Either; or
B. Neither; nor
C. Both; and
D. Not only; but also
备用高度/空速指示器提供()。
A.飞机高度和指示空速的备用指示
B.气压高度指示
C.空速指示
D.飞机升降率指示