水电站水库调度的基本任务有()。A.是确保水库大坝安全并承担水库上下游防洪任务 B.

题型:多项选择题

问题:

水电站水库调度的基本任务有()。

A.是确保水库大坝安全并承担水库上下游防洪任务

B.是保证满足电力系统的正常供电和其它有关部门的正常用水要求

C.是电力应尽可能充分利用河流水能,多发电使电力系统工作更经济

考点:水库调度工考试高级水库调度工高级水库调度工题库
题型:多项选择题

根据短文内容完成下列任务。

It's October 16th. It's Jeff's fifteenth birthday. In the morning Jeff gets up very early. He goes to Tokyo with his parents. They are going to stay there for a week. Tokyo is the capital of Japan. It's very nice. They can see many parks in Tokyo. Jeff likes Tokyo very much.

They live in Green hotel. It's very big and clean. Oh, in the hotel Jeff meets Iris old friend Lisa. The two kids are very (A)        . In the evening Jeff's father has a birthday party for Jeff in the hotel.  (B) Lisa and her parents also come to Jeff's birthday party. They have a good time. At the party Lisa sings a Japanese song for Jeff, at about twelve o clock, Jeff doesn’t go to bed. He still plays games with Lisa.

小题1:When is Jeff's birthday?

                       ___________________________

小题2:How does Jeff get to Tokyo?

                       ___________________________

小题3:选择意思相近或相同的选项替换划线邵分。

They can see many parks in Tokyo.

A.much

B.a lot of

C.a lot

D.very much小题4:选择适当的词汇完成(A)空格部分,使句意完整。

A. interesting  B. healthy         C. happy         D. unhappy

小题5:将划线部分(B)翻译为汉语。

                       ___________________________

题型:多项选择题

渔船常利用超声波来探测远处鱼群的方位,已知某超声波频率为1.0×105 Hz,某时刻该超声波在水中传播的波动图象如图15所示.

(1)从该时刻开始计时,画出 m处质点做简谐运动的振动图象(至少一个周期).

(2)现测得超声波信号从渔船到鱼群往返一次所用时间为4 s,求鱼群与渔船间的距离(忽略船和鱼群的运动).

题型:多项选择题

在下列生物碱的酸水提取液中用氯仿萃取,最易萃出的生物碱是

A.氧化苦参碱
B.秋水仙碱
C.麻黄碱
D.莨菪碱
E.苦参碱

题型:多项选择题

细分市场就是以消费需求的某些特征或变量为依据,区分具有不同需求的顾客群体。( )

题型:多项选择题

地表水采样(包括湖库水采样),除()、油等测定用水样外,容器在装入水样前,应先用该采样点水样冲洗三次。

A、硝酸盐氮

B、细菌

C、氰化物

D、硫化物

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