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【单选题】
'Keep an eye on Esther. I'll be back in a second, 'Joy Warren said to her three-year-old son Stephen, who was sitting in the back of the Buick. She didn't like leaving the children alone in the car, but the baby was sleeping soundly. And it would only be a moment. She had hardly walked 40 yards when she saw the car moving. It headed straight towards the river. Unable to swim, Joy shouted,' My babies are in that car!' Daniel Whitehead, a 17-year-old student, was walking by the river when the Buick crashed into the water just yards ahead. Without thinking, Daniel jumped in. Though a competitive swimmer, he was shocked by the icy chill Two minutes earlier, Skip Womack had pulled to a halt as the Buick ran in front of him. Now seeing it hit the water and hearing Joy's cries, Skip got out of his truck and jumped into the river. He had only one thought: if I don't get them out, they'll drown. Daniel reached the car and grabbed the door handle. But the water was only four inches beneath the window, and the door wouldn't open. With one powerful punch, Daniel and Skip broke a window. Daniel reached inside and lifted Stephen out. He placed him on his back and set out for shore. At the same time, Skip squeezed himself through the window, and managed to free Esther from beneath her seat belt. After he got out of the car with the baby, he held her over the water and swam toward the shore. All this took place just seconds before the Buick disappeared beneath the water. Later, driving home, Skip thought of his wife and children- how close he'd come to leaving them behind. He thought of the miracle he'd lived through, and how two children were still alive because he and Daniel happened to be in the right place at the right time. Why did Joy leave her children in the car?
A.
She didn't like shopping with children.
B.
She didn't like waking up her baby.
C.
Stephen was big enough to take care of his sister.
D.
It was icy cold outside.
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【判断题】多基因假说同样遵循分离规律()。
A.
正确
B.
错误
【多选题】下面哪两项不属于数据链路层的设备是?
A.
中继器
B.
交换机
C.
网桥
D.
路由器
【判断题】多基因假说同样遵循分离规律,并可用于解释超亲遗传。( )
A.
正确
B.
错误
【判断题】多基因假说同样遵循分离规律,并可解释超亲遗传。
A.
正确
B.
错误
【多选题】星盘是一个展示天球和地球关系的二维模型,他的原理基于以地球为宇宙中心的假设。它可以现实的功能很多,包括定位和预测( )等相关天体在宇宙中的位置,确定本地时间和经纬度,以及三角测距等等。
A.
太阳
B.
月亮
C.
金星
D.
火星
【判断题】多基因假说同样遵循分离规律,并可解释超亲遗传。
A.
正确
B.
错误
【单选题】下面哪两项不属于数据链路层的设备是
A.
中继器;
B.
交换机;
C.
网桥;
D.
普通集线器
【多选题】读“北半球气压带与全球大洋环流模式图”,回答问题。大洋表层环流主要是由稳定的盛行风引起的风海流,因此,大洋表层环流和大气环流有着密切的关系。在北半球,中低纬度绕副热带高压中心流动的,为一( )的环流;中高纬度绕副极地低压流动的,为一( )的环流。在南半球中高纬度为一( )的环流。
A.
顺时针方向
B.
逆时针方向
C.
南北向带状分布
D.
东西向带状分布
【判断题】多基因假说同样遵循分离规律,并可解释超亲遗传。
A.
正确
B.
错误
【简答题】地球的磁场可以近似为一偶极磁场,其离地球中心距离为r处的横向分量和纵向分量分别为 式中, 称为磁纬度(这种纬度是从地球赤道向北极或者南极来测量的)。假定地球的磁偶极矩μ m =8.00×10 22 A·m 2 。 (1)证明在纬度 处地球磁场的大小为 ; (2)证明磁场的倾角θ i 与磁纬度 的关系为 。
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