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【单选题】
设示波器水平和垂直偏转灵敏度相同,在 X 、 Y 输入端加的电压分别为 :VX=Asin(ωt+45°) , VY=Asinωt ,则荧光屏上显示的 X-Y 图形是 ( )A.
圆
B.
椭圆
C.
斜线
D.
水平直线
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【简答题】In discussing the relative difficulties of ysis which the exact and inexact sciences face, let me begin with an ogy, Would you agree that swimmers are (1) __ skilful athletes than runners (2) ...
【简答题】____swimmers do not move asfast as runners? You probably would
【单选题】能保证老年人的居家安全的照顾方法,正确的是
A.
冬季房间尽量减少通风时间,避免着凉感冒
B.
洗浴时温度不宜太高,以20℃~22C为宜
C.
夜晚入睡时点亮地灯,保证夜间如厕安全
D.
家中行走通道的两侧应多摆放家具,便于老人扶持
E.
老人皮肤感觉下降,使用热水袋保暖时水温应高些
【简答题】Experiments have _______that children can be instructed in swimming at a very early age. At a special swimming pool in Los Angeles, children become _______at holding their breath under water even befo...
【多选题】Experiments have proved that children can be instructed in swimming __1__.At a special swimming pool in Los Angeles, children become expert at __2___underwater even before they can walk. Babies of...
B.
coming up for breath
C.
gasping for air
D.
holding their breath
E.
at a very early age
F.
is very popular with
G.
prefer to
H.
are so accustomed to
I.
be reluctant to
J.
compete against
【单选题】关于一氧化碳中毒的叙述下列何项不正确
A.
CO和Hb结合生成的碳氧血红蛋白无携氧能力
B.
CO抑制RBC内糖酵解，使2，3-DPG减少，氧离曲线左移
C.
呼吸加深加快，肺通气量增加
D.
皮肤、粘膜呈樱桃红色
E.
吸入气中含0.1%CO,50%的血红蛋白与CO结合
【简答题】Experiments have proved that children can be instructed in swimming __1__.At a special swimming pool in Los Angeles, children become expert at __2___underwater even before they can walk. Babies of...
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