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【单选题】
接收换能器的作用是将 ___ 信号转换成 ___ 信号。改变其位置, 当示波器显示接收信号波峰起伏一次时,接收换能器移动距离为 ______A.
电 声 一个波长
B.
电 声 半个波长
C.
声 电 半个波长
D.
声 电 一个波长
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【单选题】What can the combined dots represent?
A.
both letters and words
B.
only individual words
C.
only letters of the alphabet
【单选题】Fred has _____ kind of humour that can only be appreciated by those willing to search beneath the surface.
A.
an obvious
B.
a hidden
C.
a subtle
D.
a controlled
【单选题】患者男，摔伤致右前臂中段肿胀、畸形、异常活动2小时。查体：前臂骨擦音存在，异常活动明显。若该患者为闭合骨折，行手法复位石膏外固定24小时后，出现患肢持续性剧烈疼痛，进行性加重。此时首先应采取的措施是（）。
A.
抬高患者肢体以减轻疼痛
B.
予以确切有效的止痛药
C.
立即解除石膏外固定
D.
局部予以硫酸镁湿敷
E.
改用其他外固定方法
F.
以上均正确
【单选题】患者,男性,30岁。右前臂挤压骨折复位小夹板固定24小时后,患肢剧烈疼痛,进行性加重。此时应首先采取措施是
A.
抬高患肢以减轻疼痛
B.
给予镇痛药物镇痛
C.
立即解除夹板外固定
D.
行X线检查
E.
静脉滴注脱水剂
【单选题】It may be debated whether individual neurons are 'tuned' to react to only a single tastant such as salt or sugar--and therefore signal only one taste quality--or whether the activity in a given neuron...
A.
illustrating the extent to which the physiological principles behind taste mirror those behind vision
B.
contrasting the available evidence for the labeled-line and across-neuron theories of taste
C.
describing the evolution of theories concerning the neurological mechanisms which determine taste
D.
demonstrating the superiority of holistic models over component models in analyzing neuron function
E.
showing that individual neurons play a negligible role in the physiological mechanisms of perception
【单选题】．The education department focuses on the__________education system，instead of only individual schools．
A.
diverse
B.
entire
C.
abrupt
D.
typical
【单选题】We should never _____ ourselves with a little book knowledge only.
A.
convince
B.
satisfy
C.
comfort
D.
benefit
【单选题】Only individual benefactors and ad hoc grants have made possible the ecological surveys already undertaken.
A.
additional
B.
governmental
C.
special
D.
organizational
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