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【简答题】
如下图所示的岸边式取水泵房,泵由河中直接抽水输入高地密闭水箱中。已知条件: 泵流量Q=160L/s,管道均采用铸铁管,吸水机压水管管道中的局部水头算是假设各为1m, 吸水管:管径Ds=400mm,长度l1=30m; 压水管:管径Dd=350mm,长度l2=200m; 水泵的效率η=70%,其他标高见下图所示。试计算: 1)泵吸入口处的真空表读数为多少mH2O?相当于多少mmHg? 2)泵扬程H=? 3)电动机输给泵的功率N=?(kW)
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【简答题】Five thousand miles is too far to travel.
【单选题】How fast will a rocket go to escape completely from the Earth's gravity?
A.
Seventy miles per second.
B.
Seven thousand miles per hour.
C.
Twenty-five thousand miles per second.
D.
Twenty-five thousand miles per hour.
【单选题】In f ormal cooperative learning groups ,t hese last from one class period to several weeks and establish for a specific task and involve students working together to achieve ______ learning goals .
A.
variable
B.
shared
C.
different
【判断题】There are three types of cooperative learning groups: f ormal cooperative learning groups ; i nformal cooperative learning groups ; and c oo perative base groups .
A.
正确
B.
错误
【判断题】Once the agreement is settled, the contracts have to be written out and the economic contract should be signed in a n in f ormal way.
A.
正确
B.
错误
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