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问题 单项选择题

DN500钢筋混凝土排水管道土方开挖，管座采用135°基础，管道结构宽0.8m,则沟槽开挖底宽为(　)m。

A．1.4

B．1.7

C．1.8

D．2.2

答案

参考答案：C

单项选择题

A client with testicular cancer is scheduled for a right orchiectomy. The day before surgery, the client asks the nurse whether losing a testicle will have influence on his manhood. Which of the following facts about orchiectomy should form the basis for the nurse’s response

A. Testosterone levels are decreased.
B. Sexual drive and libido are unchanged.
C. Sperm count increases in the remaining testicle.
D. Secondary sexual characteristics chang
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问答题

（1）一辆汽车从车站出发作匀加速运动，经10 s速度达到108 km/h .

（2）高速列车过桥后沿平直铁路匀加速行驶，经3 min速度从54 km/h提高到180 km/h .

（3）沿光滑水平地面以10 m/s 运动的小球，撞墙后以原速大小反弹，与墙壁接触时间为0.2 s .
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