一位同学吃了如下一份早餐：一块面包、一杯鲜牛奶、少量的蔬菜和水果，回答：
（1）面包的主要营养成分是淀粉，其最早开始消化的场所是____ ；
（2）牛奶的主要营养成分是蛋白质，其最终的消化产物是____ ；
（3）营养成分消化和吸收的主要场所是 。
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Through some efforts, rescuers (救援人员) cleaned up the ruins carefully which covered the mum.
Under her body lay her baby. The baby was in a small red quilt (被子) with yellow flowers. He was about
3 or 4 months' old. Since the baby was well protected by his mother's body, he was totally safe. He was
sleeping well when the rescuer carried him out, and his lovely and peaceful face warmed everyone around
him. The rescuer found there was a mobile phone in the quilt. When he looked at the screen, a message was
already there. "My dear baby, if you could live, don't forget how much I love you." Everyone who saw this
message burst into tears.
1. In this passage, the underlined word "ruins" most probably means ______. [ ]
A. 废墟
B. 遗迹
C. 雨水
2. The mum's death and her great ______ for her baby made everyone burst into tears. [ ]
A. hope
B. care
C. love
3. From the passage, we know the mum saved her baby ______.[ ]
A. with her body
B. in a small quilt
C. by a mobile phone
|
已知：x=
（1）x2+2xy+y2； （2）x2-y2． |
一同学住在21层高楼的顶楼．他想研究一下电梯上升的运动过程．某天他乘电梯上楼时携带了一个质量为4kg的重物和一个量程足够大的台秤，他将重物放在台秤上，电梯从第l层开始启动，一直运动到第21层才停下．在这个过程中，他记录了台秤在不同时段内的读数如下表所示．
| 时间/s | 台秤示数/N |
| 电梯启动前 | 40.0 |
| 0～3.0 | 48.0 |
| 3.0～12.0 | 40.0 |
| 12.0～18.0 | 36.0 |
| 18.0末 | 40.0 |
（1）电梯在最初加速阶段的加速度大小a1
（2）最后减速阶段的加速度大小a2；
（3）电梯在中间阶段上升的速度大小v；
（4）该楼房平均每层楼的高度h．
“中国地震动峰值加速度区划图”和“中国地震动皮应谱特征周期区划图”的设防水准为（）。
A.30年超越概率10％
B.50年超越概率5％
C.50年超越概率10％
D.100年超越概率5％