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【单选题】
急性阑尾炎的主要发病原因A.
胃肠功能紊
B.
阑尾腔梗阻
C.
细菌侵入阑尾腔
D.
阑尾蠕动减弱
E.
阑尾血液循环减少
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【单选题】如果力FR是F1、F2二力的合力,用矢量方程表示为FR=F1+F2,则三力大小的关系为
A.
必有FR=F1+F2
B.
不可能有FR=F1+F2
C.
必有FR>F1, FR>F2
D.
可能有FR
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