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学好化学知识有助于我们更好地爱护环境，健康生活．请回答下列有关问题： （1）2008年6月1日起，我国实行了“限塑制”．开始有偿使用可降解的塑料袋，该措施实施的意义有哪些？（写出两条） （2）我省在“五点一线”环海经济建设中，十分重视环境保护．请你提出防止水体污染的两点合理化建议． （3）下图是某品牌服装标签，指出面料中的合成纤维是什么？验证面料的成分中含有羊毛． （写出实验步骤、现象）
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举一反三
【单选题】How did the passengers react to the demand of the terrorists? A) The Muslim passengers obeyed the terrorists. B) The Muslim passengers refused and tried to hide the Christians. C) The Christian passen...
A.
The Muslim passengers obeyed the terrorists.
B.
The Muslim passengers refused and tried to hide the Christians.
C.
The Christian passengers begged the terrorists not to kill them.
D.
The Christian passengers called the police.
查看完整题目与答案
【单选题】The travel information is intended for
A.
all passengers on board the plane.
B.
passengers who want to visit the center of Sydney.
C.
passengers who visit Sydney for the first time.
D.
all crew on board the plane.
查看完整题目与答案
【多选题】According to the passage, what are the other special passengers?
A.
elderly passengers
B.
elderly passengers, passengers with infant(s) or child (children)
C.
passengers requiring special meals
D.
intoxicated passengers
E.
intoxicated passengers, stretcher passengers
F.
prisoners
查看完整题目与答案
【单选题】How did the passengers react to the demand of the terrorists?
A.
The Muslim passengers obeyed the terrorists.
B.
The Muslim passengers refused and tried to hide the Christians.
C.
The Christian passengers begged the terrorists not to kill them.
D.
The Christian passengers called the police.
查看完整题目与答案
【单选题】下列 8 种机械零件:涡轮的叶片,飞机的螺旋桨,往复式内燃机的曲轴,拖拉机 发动机的气门弹簧,起重机的起重吊钩,火车车轮,自行车的链条,纺织机的纱锭。其中有 ( )种 是专用零件。
A.
3
B.
4
C.
5
D.
6
查看完整题目与答案
【单选题】Who is not allowed on the train?
A.
Passengers who are late.
B.
Passengers with excess luggage.
C.
Passengers without reservations.
D.
Passengers who don't pay by check.
查看完整题目与答案
【单选题】下列 8 种机械零件:涡轮的叶片,飞机的螺旋桨,往复式内燃机的曲轴,拖拉机发动机的气门弹簧,起重机的起重吊钩,火车车轮,自行车的链条,纺织机的纱锭。其中有()是专用零件
A.
3 种
B.
4 种
C.
5 种
D.
6 种
查看完整题目与答案
【单选题】下列8种机械零件：涡轮的叶片、飞机的螺旋桨、往复式内燃机的曲轴、拖拉机发动机的气门弹簧、起重机的起重吊钩、火车车轮、自行车的链条、纺织机的纺锭。其中有（ ）种是通用零件。
A.
2
B.
6
C.
4
D.
5
查看完整题目与答案
【单选题】下列8种机械零件:涡轮的叶片、飞机的螺旋桨、往复式内燃机的曲轴、拖拉机发动机的气门弹簧、起重机的起重吊钩、火车车轮、自行车的链条、纺织机的纺锭。其中有( )种是专用零件。
A.
8
B.
6
C.
4
D.
2
查看完整题目与答案
【单选题】下列8种机械零件：涡轮的叶片、飞机的螺旋桨、往复式内燃机的曲轴、拖拉机发动机的气门弹簧、起重机的起重吊钩、火车车轮、自行车的链条、纺织机的纺锭。其中有（ ）种是专用零件。
A.
3
B.
6
C.
5
D.
4
查看完整题目与答案
相关题目：
【单选题】How did the passengers react to the demand of the terrorists? A) The Muslim passengers obeyed the terrorists. B) The Muslim passengers refused and tried to hide the Christians. C) The Christian passen...
A.
The Muslim passengers obeyed the terrorists.
B.
The Muslim passengers refused and tried to hide the Christians.
C.
The Christian passengers begged the terrorists not to kill them.
D.
The Christian passengers called the police.
查看完整题目与答案
【单选题】The travel information is intended for
A.
all passengers on board the plane.
B.
passengers who want to visit the center of Sydney.
C.
passengers who visit Sydney for the first time.
D.
all crew on board the plane.
查看完整题目与答案
【多选题】According to the passage, what are the other special passengers?
A.
elderly passengers
B.
elderly passengers, passengers with infant(s) or child (children)
C.
passengers requiring special meals
D.
intoxicated passengers
E.
intoxicated passengers, stretcher passengers
F.
prisoners
查看完整题目与答案
【单选题】How did the passengers react to the demand of the terrorists?
A.
The Muslim passengers obeyed the terrorists.
B.
The Muslim passengers refused and tried to hide the Christians.
C.
The Christian passengers begged the terrorists not to kill them.
D.
The Christian passengers called the police.
查看完整题目与答案
【单选题】下列 8 种机械零件:涡轮的叶片,飞机的螺旋桨,往复式内燃机的曲轴,拖拉机 发动机的气门弹簧,起重机的起重吊钩,火车车轮,自行车的链条,纺织机的纱锭。其中有 ( )种 是专用零件。
A.
3
B.
4
C.
5
D.
6
查看完整题目与答案
【单选题】Who is not allowed on the train?
A.
Passengers who are late.
B.
Passengers with excess luggage.
C.
Passengers without reservations.
D.
Passengers who don't pay by check.
查看完整题目与答案
【单选题】下列 8 种机械零件:涡轮的叶片,飞机的螺旋桨,往复式内燃机的曲轴,拖拉机发动机的气门弹簧,起重机的起重吊钩,火车车轮,自行车的链条,纺织机的纱锭。其中有()是专用零件
A.
3 种
B.
4 种
C.
5 种
D.
6 种
查看完整题目与答案
【单选题】下列8种机械零件：涡轮的叶片、飞机的螺旋桨、往复式内燃机的曲轴、拖拉机发动机的气门弹簧、起重机的起重吊钩、火车车轮、自行车的链条、纺织机的纺锭。其中有（ ）种是通用零件。
A.
2
B.
6
C.
4
D.
5
查看完整题目与答案
【单选题】下列8种机械零件:涡轮的叶片、飞机的螺旋桨、往复式内燃机的曲轴、拖拉机发动机的气门弹簧、起重机的起重吊钩、火车车轮、自行车的链条、纺织机的纺锭。其中有( )种是专用零件。
A.
8
B.
6
C.
4
D.
2
查看完整题目与答案
【单选题】下列8种机械零件：涡轮的叶片、飞机的螺旋桨、往复式内燃机的曲轴、拖拉机发动机的气门弹簧、起重机的起重吊钩、火车车轮、自行车的链条、纺织机的纺锭。其中有（ ）种是专用零件。
A.
3
B.
6
C.
5
D.
4
查看完整题目与答案