传染性非典型肺炎的传播方式为()
A.短距离空气飞沫
B.接触患者呼吸道分泌物
C.密切接触
D.性传播
E.血液传播
参考答案:A, B, C
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A. is
B. was
C. are
D. were
混凝土浇筑施工中最关键的工序是()。
A.铺料
B.平仓
C.振捣
D.养护