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【单选题】
化脓性脑膜炎病原菌不明时,抗生素首选:( )
A.
青霉素十氯霉素
B.
青霉素十链霉素
C.
青霉素十磺胺嘧啶
D.
红霉素
E.
红霉素十氯霉素
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【单选题】铰链四杆机构具有急回特性的条件是 。
A.
q >0 °
B.
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C.
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【单选题】铰链四杆机构具有急回特性的条件是 。
A.
〉0
B.
≤0
C.
行程速比系数 K=1
D.
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【单选题】铰链四杆机构具有急回特性的条件是
A.
θ>0°
B.
θ=0°
C.
K=1
【简答题】听下面5段对话。每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在 试卷的相应位置。听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对 话仅读一遍。 1. Where does Jenny's friend come from? [     ] A. China. B. Japan. C. America. 2. Why is Mr. Baker in...
【单选题】铰链四杆机构具有急回特性的条件是 。
A.
θ >0 °
B.
θ =0 °
C.
K=1
D.
K<1< /div>
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