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【单选题】
对影响螺旋桨推进特性因素理解正确的是（）。 a．盘面比大，推力大； b．螺距比大，螺旋桨推进曲线陡； c．当J增加，螺旋桨效率是增加的； d．当J增加，螺旋桨推进特性曲线平坦。A.
a+b+d
B.
a～d
C.
b+d
D.
b+c+d
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【简答题】阅读理解。 Look at this. It's a blue bag. It is my bag. What's in it? Look, this is my English book. It's blue, too. My Chinese book is also in my bag. It is yellow. This is my pencil case. It's big and ni...
【单选题】_____ bag is on the desk. Where is _____ bag? [ ]
A.
My, your
B.
I, your
C.
I, you
D.
My, you
【简答题】Look at this. It's a blue bag. It is my bag. What's in it? Look, this is my English book. It's blue, too. My Chinese book is also in my bag. It is yellow. This is my pencil case. It's big and nice. I ...
【简答题】阅读理解。 Look at this It’s a blue bag. It is my bag. What’s in it? Look, this is my English book. It’s blue, too. My Chinese book is also in my bag. It is yellow. This is my pencil case. It’s big and nic...
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【多选题】如图所示,A、B两点在同一条竖直线上,B、C两点在同一条水平线上。现将甲、乙、丙三小球分别从
A.
B、C三点水平抛出,若三小球同时落在水平面上的D点,则以下关于三小球运动的说法中正确的是( ) 三小球在空中的运动时间一定是t 乙 =t 丙 >t 甲
B.
三小球抛出时的初速度大小一定是v 甲 >v 乙 >v 丙
C.
甲小球先从A点抛出,丙小球最后从C点抛出
D.
从A、B、C三点水平抛出的小球甲、乙、丙落地时的速度方向与水平方向之间夹角一定满足θ 丙 >θ 乙 >θ 甲
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