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【单选题】
暗敷于现浇钢筋混凝土楼板内的可挠金属电线保护套管，其表面混凝土覆盖层不应小于（）mm。暗敷于地下的可挠金属电线保护套管的管路不应穿过设备基础。在穿过建筑物基础时，保护管保护A.
10
B.
15
C.
20
D.
30
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文：M: If I were you, I would travel by plane instead of by bus. It will save your precious time. M: But flying always makes me so nervous. Q: What does the man mean? (17)
A.
He prefers taking a plane because the bus is too slow.
B.
He prefers taking a bus because the plane makes him nervous.
C.
He prefers staying at home to traveling by plane.
D.
He prefers traveling with the woman.
【单选题】关于胃排空的说法,不恰当的是
A.
混合性食物在进餐后4~6小时完全排空
B.
胃的蠕动是胃排空的动力
C.
液体食物排空速度快于固体食物
D.
糖类食物排空最快,蛋白质最慢
E.
迷走神经兴奋促进胃排空
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