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【单选题】
Which of the following is the definition of CAS latency？（）A.
CAS latency is the ratio between the column access time and the clock cycle time.
B.
CAS latency is the ratio between the row access time and the clock cycle time.
C.
CAS latency is the ratio between the column access time and the data burst transfer time.
D.
CAS latency is the ratio between the row access time and the data burst transfer time.
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【单选题】Typical differential amplifier circuit changes from double-ended output to single-ended output, common-mode voltage gain .
A.
increase
B.
decrease
C.
unchanged
D.
unable to determine
【单选题】女, 55岁,因发作性胸闷、咳嗽就诊,诊断为支气管哮喘。医嘱给予糖皮质激素吸入治疗,下列用药指导中正确的是
A.
“吸入激素的主要作用是快速缓解症状” ”
B.
“若哮喘症状缓解，即可停止用药”
C.
“吸入激素不会有任何副作用”
D.
“吸入激素后要漱口”
E.
“如果您要进行运动，可在此前预防性吸入激素
【单选题】试问在下述有关机械循环热水供暖系统的表述中,（ ）是错误的。
A.
供水干管应按水流方向有向上的坡度
B.
集气罐设置在系统的最高点
C.
使用膨胀水箱来容纳水受热后所膨胀的体积
D.
循环水泵装设在锅炉入口前的回水干管上
【单选题】Typical differential amplifier circuit changes from double-ended input to single-ended input, common-mode voltage gain .
A.
increase
B.
decrease
C.
unchanged
D.
unable to determine
【单选题】Typical differential amplifier circuit changes from double-ended input to single-ended input, differential-mode voltage gain .
A.
increase
B.
decrease
C.
unchanged
D.
unable to determine
【简答题】请列举 3 项牵引电机检修时可能会用到的材料( )、 ( )、 ( )
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