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【判断题】
超声波换能器采用石英或陶瓷材料制作，给压电元件加上交变的电压后，就会产生振动，振动元件在流体中发出声波。利用压电效应发射和接收声波，通过检测流体对超声束(或超声脉冲)的影响来测量流体体积流量。Ultrasonic transducers, made of quartz or ceramic, vibrate when alternating voltages are applied to the piezoelectric elements, which emit sound waves in the fluid. The fluid volume flow is measured by measuring the fluid's effect on the ultrasonic beam (or ultrasonic pulse) by transmitting and receiving sound waves using the piezoelectric effect.A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】通过 工具绘制形状间的连接线。
【单选题】The reason for the mélange character of early European culture is that __________.
A.
Europe was an importer of cultural and other goods
B.
the Western model did not work in Europe
C.
Western culture cannot co-exist with other local cultures
D.
Europe refused to develop its own culture
【单选题】患儿，4 个月，睡眠时常烦躁哭闹，难以入睡，诊断为佝偻病，给予维生素D 3 30 万IU 肌注后突然发生全身抽搐3 次，每次约20～60 秒，发作停止时精神如常，体重6kg，体温37．9℃,有枕秃及颅骨软化，血清钙1．68mmol/L。对该患儿的护理应首先采取
A.
继续补充维生素D
B.
降低患儿体温
C.
在病床两侧加床档
D.
尽快给予葡萄糖酸钙
E.
及时纠正碱中毒
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