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【简答题】
机械波波动方程为 y=0.03cos6 π (t+0.01x)(SI) ，则 () 。 (A) 其振幅为 3 m (B) 其周期为 1/3s (C) 其波速为 10 m/s (D) 波沿 x 轴正向传播
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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.
【单选题】甲企业 “ 应收账款 ” 账户期初借方余额 40 000 元,本期减少发生额为 15 000 元,该账户期末借方余额 60 000 元,则企业本期必定还发生了( )
A.
应收账款增加 20 000 元
B.
应收账款减少 20 000 元
C.
应收账款增加 35 000 元
D.
应收账款减少 35 000 元
【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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