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【单选题】
男性，40岁。诉刷牙时牙出血3个月余。口腔有异味。口腔检查：牙龈缘尤其是上下前牙唇侧龈缘和龈乳头暗红色，松软缺乏弹性，探诊牙龈出血，菌斑指数和牙龈指数平均为2．5，无牙周袋，无松动。预防方法是（）A.
预防性长期服用抗生素
B.
定期复查和洁治
C.
注意掌握正确的刷牙方法
D.
多食精细食物
E.
B+C
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知识点：
皮皮学刷刷变学霸
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【简答题】DWDM技术即____,利用一根光纤可以同时传输多个____波长的光载波特点,把光纤可以应用的波长范围划分为若干个波段,每个波段用作一个独立的通道传输一种预定波长的光信号技术。
【简答题】Section C Directions: in this section, you will hear three recordings of lectures or talks followed by three or four questions. the recordings will be played only once. after you hear a question,you m...
【简答题】Section C Directions: in this section, you will hear three recordings of lectures or talks followed by three or four questions. the recordings will be played only once. after you hear a question,you m...
【单选题】Section C Directions:In this section, you will hear three recordings of lectures or talks followed by three or four questions. The recordings will be played only once. After you hear a question, you m...
A.
They should be done away with.
B.
They are necessary in our lives.
C.
They enrich our experience.
D.
They are harmful to health.
【单选题】第 26 题(本题:1分) 下列定义数组的语句中,正确的是( )。
A.
#define N 10 int x[N]；
B.
int N＝10； int x[N]；
C.
int x[0..10]；
D.
int x[ ]；
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