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【单选题】
为了保证污水生物处理要按碳氮磷比配给营养,废水生物处理中好氧微生物群体活性污泥的碳氮磷比要求为BOD 5 :N:P= ( )。A.
100 ：5：1
B.
350 ～500：5：1
C.
50 ：5：1
D.
25 ：5：1
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【单选题】听力原文：M: Are you looking forward to your trip to Canada? W: I can't wait to see Canada, but I'm scared stiff of the journey. My husband insists on flying, but I want to sail. Planes make me nervous. M:...
A.
The woman.
B.
Her husband.
C.
The woman and her husband.
D.
The woman and her friend.
【单选题】听力原文：M: Are you looking forward to your trip to Canada, Julie? W: I can't wait to see Canada, but I'm scared of the journey. My husband insists on flying, but I want to sail. Planes make me nervous. M...
A.
The transportation of the trip.
B.
The air-sick.
C.
The sea-sick.
D.
The quarrel between a couple.
【简答题】设随机变量 且满足P{X 1 X 2 =0}＝1，则P{X 1 ＝X 2 }等于[ ] (A) 0； (B) 1/4； (C) 1/2； (D) 1．
【简答题】设随机变量 且满足P{X 1 X 2 =0}＝1，则P{X 1 ＝X 2 }等于[ ] (A) 0； (B) 1/4； (C) 1/2； (D) 1．
【单选题】听第9段材料，回答第15～17题。 Text 9 M: Are you looking forward to your trip to Canada, Susan? W: I can't wait to see Canada, Jason, but I'm scared stiff of the journey. My husband insists on flying, but I want t...
A.
Taking a voyage.
B.
Taking a train.
C.
Taking a flight.
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