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【单选题】
经调查得知,甲乙两地的恶性肿瘤粗死亡率均为89.93/10万,但经标准化后,甲地恶性肿瘤的死亡率为82.74/10万,乙地为93.52/10万,发生此现象最有可能的原因是( )A.
乙地的恶性肿瘤防治工作做的比甲地好
B.
甲地的老年人口在总人口中所占的比例比乙地多
C.
乙地的老年人口在总人口中所占的比例比甲地多
D.
甲地诊断技术比乙地更高
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【简答题】革兰氏染色结果,G-为 色,G+为 色。
【简答题】革兰氏染色结果G-为
【简答题】革兰氏染色结果G-为 G+为紫色。
【单选题】An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus...
A.
The breaker should be closed when one synchronizing lamp is dark and the other is bright
B.
The breaker should be closed when both synchronizing lamps are bright
C.
The frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the bus
D.
A portable phase sequence indicator must be used to verify the information from the lamps
【单选题】What is the purpose of the alternator reverse power trip?
A.
To pr the alternator from “motoring” by being supplied power from other parallel alternator
B.
To pr parallel operation if the excitation field voltage is reversed
C.
To pr the alternator from being paralleled if it is out of phase with the main switchboard
D.
To give automatic disconnection of the circuit breaker when you are taking the alternator off the switchboard
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