施工现场生产区距离集中爆破区应不小于()m。
A.200
B.300
C.400
D.500
参考答案:D
Was it from Mary, _______ was working at a department store, ______ you learned the news?
A.who; who
B.that; which
C.who; that
D.who; which
持续胎儿循环是指()
A.肺循环压力高于体循环压力
B.肺炎、低氧血症、酸中毒可诱发
C.卵圆孔、动脉导管开放,右向左分流
D.卵圆孔、动脉导管开放,左向右分流
E.紫绀明显,吸氧可缓解