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【单选题】
20 °C的水与 N 2 气逆流接触以脱除水中溶解的 O 2 气。塔底入口的 N 2 气中含氧体积分数为 0.1% ,设气液两底达到平衡,平衡关系服从亨利定律, 20 ° C 下氧气的 E 为 4.06 ́ 10 6 kPa 。求下列两种情况下,水离开塔底时的最低含氧量,以 mg × m -3 水表示。( 1 )操作压力(绝对)为 101.3 kPa 。( 2 )操作压力(绝对)为 40 kPa 。下列正确的答案是A.
44.36 ； 17.52
B.
47.16 ； 18.51
C.
40.16 ； 17.31
D.
43.26 ； 17.21
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【简答题】型腔和分流道的排列有（）和（）两种。
【多选题】The documents such as bill of lading，air waybill，sea waybill and insurance policy used for international trade play very important roles for the parties concerned．Please point out which of the followi...
A.
Bill of Lading
B.
Sea Waybill
C.
Insurance Policy
D.
Air Waybill
【多选题】The documents such as bill of lading, air waybill, sea waybill and insurance policy used for international trade play very important roles for the parties concerneD．Please point out which of the follo...
A.
Bill of Lading
B.
Sea Waybill
C.
Insurance Policy
D.
Air Waybill
【单选题】Their country has plenty of oil, ______ ours has none.
A.
where
B.
as
C.
whereas
D.
which
【多选题】The sea waybill is one of the shipping documents used for sea transportation and serve as（ ）.
A.
cargo receipt
B.
document of title
C.
evidence of contract of cargo transportation
D.
negotiable document
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