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【简答题】
某学校化学兴趣小组为探索金属回收物的综合利用，专门设计实验用含有铝、铁、铜的合金制取纯净的氯化铝溶液、绿矾晶体（FeSO 4 ·7H 2 O）和胆矾晶体（CuSO 4 ·5H 2 O），其实验方案如下： 请回答下列问题： （1）过滤用的玻璃仪器有________。 （2）小组成员经过检测，发现制得的绿矾不纯，试分析原因：________________________，要想由沉淀I最终制得纯度较高的绿矾，改进：______________________。 （3）小组成员从资料中获知H 2 O 2 是一种绿色氧化剂，在滤渣B中加入稀硫酸和H 2 O 2 可以使B溶解，则该反应的化学方程式为______________________。 （4）有同学提出可将方案中最初溶解合金的盐酸改用烧碱，重新设计方案，也能最终制得三种物质，你认为后者方案相对于前者方案________（填“更合理” 或“不合理”），理由是__________。
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【单选题】我国居民有将许多食物混合食用的传统习惯,其中之一是腊八粥,其理论基础是
A.
氨基酸模式
B.
蛋白质互补作用
C.
蛋白质功效比值
D.
生物价
E.
蛋白质的消化率
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【单选题】When asked by the police, he said that he remembered ______ at the party, but not
A.
to arrive; leaving
B.
to arrive; to leave
C.
arriving; leaving
D.
arriving; to leave
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【单选题】听力原文： The train I was traveling on was already half an hour late. I had planned to arrive in Chicago at 7:00 in time to catch the 7:50 train to St. Louis, but there was no hope of that now. I explaine...
A.
At 7:00.
B.
At 7:50.
C.
In time.
D.
Behind its time.
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【单选题】“When will your father _________ Shanghai?” “He ________  at 8:00 this Monday.”
A.
arrive at, will arrive
B.
arrive in , will arrive
C.
arrive ,will arrive in
D.
arrive, will arrive at
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【简答题】— Sorry for being late. I should have called you earlier. —__________. I've just arrived A: That's no trouble B; You are welcome C; That's all right
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【单选题】Hello! I'm glad to see you here. When _____ you _____? [     ]
A.
did, arrive
B.
will arrive
C.
have, arrived
D.
are arriving
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【单选题】Jane was disappointed that most of the guests when she at the party.
A.
left; had arrived
B.
left; arrived
C.
had left; had arrived
D.
had left; arrived
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【单选题】_________, they delivered the message as quickly as they could.
A.
Arriving at
B.
On arriving
C.
When arriving
D.
Arrived
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【单选题】我国居民有将许多食物混合食用的传统食用习惯,其中之一是腊八粥,其理论基础是:
A.
氨基酸模式
B.
蛋白质互补作用
C.
蛋白质功效比值
D.
蛋白质生物价
E.
食物热效应
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【单选题】I f yo u nee d an y thi n g fr o m us , pl e as e fee l fre e t o （ ） th e cal l but t o n dur i n g the whole flight.
A.
press
B.
click
C.
push
D.
pull
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【单选题】我国居民有将许多食物混合食用的传统习惯,其中之一是腊八粥,其理论基础是
A.
氨基酸模式
B.
蛋白质互补作用
C.
蛋白质功效比值
D.
生物价
E.
蛋白质的消化率
查看完整题目与答案
【单选题】When asked by the police, he said that he remembered ______ at the party, but not
A.
to arrive; leaving
B.
to arrive; to leave
C.
arriving; leaving
D.
arriving; to leave
查看完整题目与答案
【单选题】听力原文： The train I was traveling on was already half an hour late. I had planned to arrive in Chicago at 7:00 in time to catch the 7:50 train to St. Louis, but there was no hope of that now. I explaine...
A.
At 7:00.
B.
At 7:50.
C.
In time.
D.
Behind its time.
查看完整题目与答案
【单选题】“When will your father _________ Shanghai?” “He ________  at 8:00 this Monday.”
A.
arrive at, will arrive
B.
arrive in , will arrive
C.
arrive ,will arrive in
D.
arrive, will arrive at
查看完整题目与答案
【简答题】— Sorry for being late. I should have called you earlier. —__________. I've just arrived A: That's no trouble B; You are welcome C; That's all right
查看完整题目与答案
【单选题】Hello! I'm glad to see you here. When _____ you _____? [     ]
A.
did, arrive
B.
will arrive
C.
have, arrived
D.
are arriving
查看完整题目与答案
【单选题】Jane was disappointed that most of the guests when she at the party.
A.
left; had arrived
B.
left; arrived
C.
had left; had arrived
D.
had left; arrived
查看完整题目与答案
【单选题】_________, they delivered the message as quickly as they could.
A.
Arriving at
B.
On arriving
C.
When arriving
D.
Arrived
查看完整题目与答案
【单选题】我国居民有将许多食物混合食用的传统食用习惯,其中之一是腊八粥,其理论基础是:
A.
氨基酸模式
B.
蛋白质互补作用
C.
蛋白质功效比值
D.
蛋白质生物价
E.
食物热效应
查看完整题目与答案
【单选题】I f yo u nee d an y thi n g fr o m us , pl e as e fee l fre e t o （ ） th e cal l but t o n dur i n g the whole flight.
A.
press
B.
click
C.
push
D.
pull
查看完整题目与答案