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【多选题】
“四不放过”原则指的是:A.
事故原因分析不清不放过
B.
安全防范措施不落实不放过
C.
责任人和相关人员未受到教育不放过
D.
责任人未追究责任不放过
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】听力原文： Today when a man steps on to the moon, or something new and important happens, the world learns about it immediately. What did the newspapers say about that first flight in 19037 Strangely enoug...
A.
They were able to fly it in the air.
B.
They were able to stay up in the air for half an hour and more in the machine.
C.
They were able to carry travelers.
D.
They were 'able to fly in mound Dayton.
【单选题】听力原文： Today when a man steps on to the moon, or something new and important happens, the world learns about it immediately. What did the newspapers say about that first flight in 1903? Strangely enoug...
A.
They were able to fly it in the air.
B.
They were able to stay up in the air for half an hour and more in the machine.
C.
They were able to carry travelers.
D.
They were able to fly in around Dayton.
【简答题】判断正误 （1）浮在水面上的空心铁球，比沉在水底的同体积实心铁球受到的浮力一定大些．（______） （2）当物体所受浮力等于物体的重力时，物体就一定漂浮在液面上．（______） （3）物体上浮时受到浮力大，下沉时受到的浮力小． （______） （4）体积相同的木球和铁球浸没在水中，木球上浮，铁球下沉，在木球没有浮在水面之前，则木球所受的浮力等于铁球所受的浮力．（______） （5）只有上浮...
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