皮皮学，免费搜题
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【单选题】
涡轮式搅拌器的特点不包括( )A.
结构简单
B.
溶氧速率高
C.
剪切力大
D.
气泡破碎程度低
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参考解析：
知识点：
皮皮学刷刷变学霸
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【简答题】厂区枢纽包括水电站（）、（）、引水道、尾水道、主变压器场、高压开关站、交通道路和行政及生活区建筑等组成的综合体。
【单选题】The nurse is caring for a during the second stage of labor. On assessment, the nurse notes a slowing of the fetal heart rate and a loss of variability. Which is the initial nursing action?
A.
Turn the onto her side and give oxygen by face mask at 8 to 10 L/min.
B.
Turn the onto her back and give oxygen by face mask at 8 to 10 L/min.
C.
Turn the onto her side and give oxygen by nasal cannula at 2 to 4 L/min.
D.
Turn the onto her back and give oxygen by nasal cannula at 2 to 4 L/min.
【简答题】变频器中上限频率为 P1, 其设定值通常为 (
)A. 50 B. 40 C. 30 D. 60
【单选题】The heart rate of a healthy in quiet environment is about
A.
80-150 times/min
B.
50-80 times/min
C.
60-1OOtimes/min
【单选题】When the heart rate of a normal person exceeds 180 beats / min, the main reason for the decrease in cardiac output is
A.
shortened ventricular filling period
B.
Shorter ejection period
C.
Slowing down the ejection period
D.
Insufficient ventricular muscle oxygen supply
【单选题】The heart rate of a healthy in quiet environment is about
A.
80-150 times/min
B.
50-80 times/min
C.
60-100 times/min
【简答题】发送信息给以下哪一个IP地址等于是将消息发送给自己?A. A. 128.0.0.1 B. A. 127.0.0.1 C. A. 255.0.0.1 D. A. 126.0.0.1
【单选题】如果轴的工作转速为n,一阶临界转速为nc1,二阶临界转速为nc2,为了保证轴的振动稳定性,则对于刚性轴应使________。
A.
加大阶梯轴各部分直径
B.
碳钢改为合金钢
C.
改变轴承之间的距离
D.
改变轴上零件的位置
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