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【简答题】
For British and American people, birthdays are very special days, especially for children. Parents and family members send cards and give presents. Often, children have birthday parties. They invite their friends, who bring presents to the party. There are games, and prizes, and a birthday “tea” with sandwiches, biscuits, ice cream and a birthday cake. There are small candles on the cake. If the child is four years old, he has four candles. If he is five, he has five candles, and so on. When the little guests leave, they each get a small present and a balloon. Birthdays are special days for older people too. Family members and friends give presents, and send birthday cards. When people meet someone on their birthday, sometimes even at work, they say “Happy birthday!” or “Many happy returns of the day!”(this means “I hope you will live to have many more birthdays.” The most important birthday is the eighteenth. When you are eighteen, you are grown up. You can vote, you can get married, and you can even go to prison! People often have a big party on their eighteenth birthday, and receive a lot of presents. Until a few years ago, the most important birthday was the twenty-first, and some people still wait for their big party until they are twenty –one. Fortieth and seventieth birthdays are also rather special, and in Britain , if you live to be a hundred, the Queen sends you her congratulations.
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【单选题】设 入射 波的波动方程为 =Acos2π(t/T-x/λ) ,在 x = 0 处发生反射,反射点为一节点,则反射波的波动方程为
A.
=Acos[2π(t/T-x/λ)-0]
B.
=Acos[2π(t/T-x/λ)+π]
C.
=Acos[2π(t/T+x/λ)-0]
D.
=Acos[2π(t/T+x/λ)+π]
【单选题】对生长卵泡的错误描述是
A.
有一层卵泡细胞
B.
有卵泡膜
C.
有透明带和放射冠
D.
有卵泡腔
【判断题】移动平均法是一种基础的数学预测方法
A.
正确
B.
错误
【多选题】远渡重洋求学,同学们一定关注自己的心理健康情况,发现自己情绪低落时,应该
A.
自我疏导
B.
与身边的朋友或国内亲友谈心,疏导不良情绪
C.
寻求专业医生的帮助
D.
一时的情绪低落是正常现象,可以听之任之
【单选题】( )是一种基础的数学预测方法。
A.
直观法
B.
移动平均法
C.
移动加权平均法
D.
指数平滑法
【简答题】如果入射波的方程是y 1 =Acos2π(t/T+x/λ),在x=0处发生反射后形成驻波,反射点为波腹,设反射波的强度不变,则 反射波的方程式为 , 在x= 2λ/3处质点合振动的振幅等于 。
【单选题】对生长卵泡的描述中,错误的是()
A.
体积大小不等
B.
分初级卵泡和次级卵泡
C.
从幼年期开始出现
D.
卵母细胞周围有透明带
E.
卵泡细胞可排列为多层
【简答题】(11分)A、B、C、D四种短周期元素,原子序数依次增大,A原子的最外层上有4个电子;B的阴离子和C的阳离子具有相同的电子层结构,B与C的单质在加热条件下反应,生成一种淡黄色的固体E;D的L层电子数等于K、M两个电子层上的电子数之和。 (1)写元素符号:A为____ ____,B为____ ____。 (2)写出元素C在周期表中的位置____ ____。 (3)D的最高价氧化物的水化物化学式是 。...
【单选题】下列选项是关于内存与外存的比较,其中错误的是()
A.
外存的存取速度慢
B.
内存的成本高,容量相对较小
C.
CPU可以直接对内存中的指令进行读写
D.
外存是易失性存储器,用于临时存放信息
【单选题】发生交通事故后,如有人员受伤,第一时间应抢救伤员。
A.
Y
B.
N
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