舌后坠是造成心搏骤停病人呼吸道阻塞最常见的原因。()
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Attandances at basketball matches have____ since the coming of television.
A. dropped in
B. dropped down
C. dropped off
D. dropped out
当对正态总体均值检验时,如果总体方差未知则应该进行()。
A. Z检验
B. F检验
C. t检验
D. X2检验
淡水淹溺时血容量增加,血中主要电解质变化是钠降低,钾升高。()
A.In additionB.For exampleC.Above allD.After all
A. In addition
B. For example
C. Above all
D. After all