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【单选题】
出现颈动脉异常搏动的是()。A.
主动脉瓣关闭不全
B.
二尖瓣关闭不全
C.
主动脉瓣狭窄
D.
三尖瓣关闭不全
E.
二尖瓣狭窄
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举一反三
【单选题】The owner of the restaurant was afraid of ___________ in debt and decided to do some research _______ healthy foods to change the situation.
A.
to be; on
B.
being; to
C.
to be; in
D.
being; into
【简答题】The restaurant has been ______ sale by its owner.
【简答题】The restaurant has been ______ sale by its owner.
【单选题】下列离子方程式书写正确的是 [ ]
A.
Na 2 O 2 与水的反应：Na 2 O 2 +H 2 O=2Na + +2OH - +O 2 ↑
B.
CO 2 通入Na 2 CO 3 溶液中：CO 2 +CO 3 2- +H 2 O=2HCO 3 -
C.
澄清石灰水中通入足量CO 2 ：Ca 2+ +2OH - +CO 2 =CaCO 3 ↓+H 2 O
D.
小苏打溶液中加入过量盐酸：CO 3 2- +2H + =CO 2 ↑+H 2 O
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