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【判断题】
对于下降沿触发有效的边沿D触发器来说,在时钟控制信号CP下降沿到来时,边沿D触发器的次态是保持原状态不变。
A.
正确
B.
错误
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举一反三
【单选题】孕妇血容量达高峰的时间是
A.
孕12~19周
B.
孕20~28周
C.
孕28~30周
D.
孕32~34周
E.
孕38~40周
【单选题】“Eighth” is pronounced _______.
A.
[eitΘ]
B.
[eiΘ]
C.
[eite]
D.
[eie]
【单选题】eighth
A.
n.超市
B.
a.,ad. &n第八
C.
int.再见
【简答题】The main reason for the reduction of the species of freshwater fish is ______.
【单选题】What is the main reason for people paying attention to food waste?
A.
To lower the cost of food waste.
B.
To save more food for the world.
C.
To keep the dining room clean.
D.
To reduce the effort of cooking.
【单选题】Saturday is the  _____day of the week. [     ]
A.
sixth
B.
seventh
C.
eighth
【简答题】The main reason for the increasing popularity of these aircrafts __________________ (不是乘飞机不昂贵,而是因为乘飞机是件有趣的事).
【简答题】The main reason why an organic compound is vital is that ______.
【简答题】Medicare is the main reason of the majority of the uncontrolled growth in federal spending and the deficit.
【单选题】X线摄影用胶片可分为:①感蓝胶片:其吸收光谱的峰值在420nm。主要为标准感度的通用型胶片,适用于一般摄影中的大部分,性能适中,低灰雾高对比,可使骨骼、空气和造影剂之间对比增强。②感绿胶片(扁平颗粒胶片):其吸收光谱的峰值在550nm。它是将三维卤化银颗粒切割成扁平状,以预期的方式排列,并在乳剂中加入了一层防荧光交叠效应的染料。③乳腺摄影用胶片:是一种高分辨率、高对比、对绿色光敏感的乳腺专用胶片。...
A.
医用胶片不属于银盐感光材料
B.
感蓝胶片也称色盲片
C.
可与任何增感屏配合使用
D.
可用于乳腺摄影
E.
灰雾度高
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