半导体激光器(LD)的主要适用于()的光纤通信系统。
A.长距离大容量
B.短距离大容量
C.长距离小容量
D.短距离小容量
参考答案:A
阅读短文,判断句子正(T)误 (F)。
I am a doctor. I work at night. I go to work at 6:30 in the evening. I eat dinner at 10:00. I usually go home
at 8:00 in the morning. After breakfast, I go to bed at 9:00. I usually get up at 2:30 in the afternoon. I eat my
lunch at 3:00. Then I play sports at 4:00 in the afternoon This is my day. I enjoy my life.
( ) 1. I am a doctor.
( ) 2. I go to work at 6:30 in the morning.
( ) 3. After dinner, I go to bed at 9:00.
( ) 4. I usually get up at 2:30 pm.
( ) 5. I play sports at 4:00 pm.
患儿,女,1岁腹泻3月余。患儿发病以来食欲较差,体检:精神差、消瘦、肌肉松弛,体重6.9kg,诊断为中度营养不良。
为该患儿每日供给的热量应()
A.由少量逐渐增至稍低于正常需要量
B.由少量迅速增至稍超过正常需要量
C.由少量逐渐增至超过正常需要量
D.由少量逐渐增至正常需要量
E.由少量迅速增至正常需要量