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【单选题】
破伤风的发病机理是A.
破伤风梭菌侵入中枢神经系统
B.
破伤风梭菌通过血液侵入脊髓前角
C.
破伤风溶血毒素引起败血症
D.
破伤风痉挛毒素侵入中枢神经系统
E.
以上都不是
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皮皮学刷刷变学霸
举一反三
【单选题】Passengers on board aren't allowed _____ calls during take-off．
A.
making or receiving
B.
to make or receive
C.
to have made or received
D.
having made or received
【单选题】_______ has been announced, our government will take more measures to make the falling economics recover as soon as possible.
A.
That
B.
As
C.
It
D.
What
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