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【单选题】
若X1,X2...Xn是来自总体X的一个简单随机样本,则X1,X2...Xn满足( )
A.
X1，X2…Xn相互独立，但不一定同分布
B.
X1，X2…Xn相互独立同分布，但与总体不一定同分布
C.
X1，X2…Xn相互独立且均与总体同分布
D.
X1，X2…Xn与总体同分布，但不一定相互独立
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举一反三
【多选题】常见的受弯、剪、扭的构件有（）
A.
雨蓬梁
B.
折梁
C.
吊车梁
D.
现浇框架边梁
E.
柱
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【单选题】听力原文：WA I was just trying to pay my parking fees, and the machine I was using ate my money. It's the machine on the second floor parking deck. MB Huh, that's strange. It's never done that before. Do y...
A.
At a bank
B.
In a parking garage
C.
Near a food vending machine
D.
Next to a public telephone booth
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【单选题】某通信机房设置七氟丙烷预制灭火系统，该系统应由（）种启动方式。
A.
1
B.
2
C.
3
D.
4
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【单选题】听力原文：WA I'm interested in your packaging system, but it's so much more expensive than your competitors'. MB You're right. Our prices are definitely higher than systems from other brands in the same ca...
A.
They are made with high-quality parts.
B.
They come with training and maintenance plans.
C.
They are built according to customer specifications.
D.
They have more functions than systems made by competitors.
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【多选题】下列构件中,属于常见的混凝土受扭构件的为( )。
A.
雨棚梁
B.
中间跨主梁
C.
次梁边跨的主梁
D.
弯梁与折梁等
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【单选题】I'm writing to()a position as a computer engineer in your company.
A.
thank for
B.
wait for
C.
apply for
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【多选题】下列构件中，属于常见的混凝土受扭构件的有()。
A.
雨棚梁
B.
中间跨主梁
C.
弯梁与折梁等
D.
次梁边跨的主梁
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【单选题】听力原文：M: I'm going to Hong Kong and Singapore next month. W: Oh, really? How nice! I was in Hong Kong last year and I eally enjoyed it. M: And what about Singapore? W: Well, it's smaller, and much less...
A.
It's much better than Hong Kong.
B.
It's smaller than Hong Kong but more crowded.
C.
It has better shops and stores than Hong Kong.
D.
It's cleaner and much less crowded than Hong Kong.
查看完整题目与答案
【单选题】某通讯机房设置七氟丙烷预制灭火系统,该系统应有()种启动方式。
A.
1
B.
2
C.
3
D.
4
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【单选题】听力原文：WA Hi. This is Erika Heaton. I'm leaving on vacation soon and I was wondering if you could hold my mail until I get back. MA Sure, we can hold mail at the post office for up to one month. Could I...
A.
On vacation
B.
On a business trip
C.
To an international conference
D.
To study abroad for the summer
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【多选题】常见的受弯、剪、扭的构件有（）
A.
雨蓬梁
B.
折梁
C.
吊车梁
D.
现浇框架边梁
E.
柱
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【单选题】听力原文：WA I was just trying to pay my parking fees, and the machine I was using ate my money. It's the machine on the second floor parking deck. MB Huh, that's strange. It's never done that before. Do y...
A.
At a bank
B.
In a parking garage
C.
Near a food vending machine
D.
Next to a public telephone booth
查看完整题目与答案
【单选题】某通信机房设置七氟丙烷预制灭火系统，该系统应由（）种启动方式。
A.
1
B.
2
C.
3
D.
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查看完整题目与答案
【单选题】听力原文：WA I'm interested in your packaging system, but it's so much more expensive than your competitors'. MB You're right. Our prices are definitely higher than systems from other brands in the same ca...
A.
They are made with high-quality parts.
B.
They come with training and maintenance plans.
C.
They are built according to customer specifications.
D.
They have more functions than systems made by competitors.
查看完整题目与答案
【多选题】下列构件中,属于常见的混凝土受扭构件的为( )。
A.
雨棚梁
B.
中间跨主梁
C.
次梁边跨的主梁
D.
弯梁与折梁等
查看完整题目与答案
【单选题】I'm writing to()a position as a computer engineer in your company.
A.
thank for
B.
wait for
C.
apply for
查看完整题目与答案
【多选题】下列构件中，属于常见的混凝土受扭构件的有()。
A.
雨棚梁
B.
中间跨主梁
C.
弯梁与折梁等
D.
次梁边跨的主梁
查看完整题目与答案
【单选题】听力原文：M: I'm going to Hong Kong and Singapore next month. W: Oh, really? How nice! I was in Hong Kong last year and I eally enjoyed it. M: And what about Singapore? W: Well, it's smaller, and much less...
A.
It's much better than Hong Kong.
B.
It's smaller than Hong Kong but more crowded.
C.
It has better shops and stores than Hong Kong.
D.
It's cleaner and much less crowded than Hong Kong.
查看完整题目与答案
【单选题】某通讯机房设置七氟丙烷预制灭火系统,该系统应有()种启动方式。
A.
1
B.
2
C.
3
D.
4
查看完整题目与答案
【单选题】听力原文：WA Hi. This is Erika Heaton. I'm leaving on vacation soon and I was wondering if you could hold my mail until I get back. MA Sure, we can hold mail at the post office for up to one month. Could I...
A.
On vacation
B.
On a business trip
C.
To an international conference
D.
To study abroad for the summer
查看完整题目与答案