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【单选题】
利用牛顿第三定律,有人设计了一种交通工具,在平板车上装了一个电风扇,风扇运转时吹出的风全部打到竖直固定在小车中间的风帆上,靠风帆受力而向前运动,如图 4.5.4 所示。对于这种设计,下列分析中正确的是 ( )A.
根据牛顿第二定律，这种设计能使小车运行
B.
根据牛顿第三定律，这种设计能使小车运行
C.
这种设计不能使小车运行，因为它违反了牛顿第二定律
D.
这种设计不能使小车运行，因为它违反了牛顿第三定律
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A.
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C.
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A.
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can’t have
C.
would have
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【简答题】卵巢的功能有哪些？
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