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【简答题】
有一三相对称负载,其每项的电阻 R =8 W , XL =6 W 。如将负载联成星形接于线电压为 380V的三相电源上,则UL= 380V ,UP= , IP= 22A 。引起这种现象的主要原因。
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【简答题】阅读短文，选择正确答案。 Some parents are worrying that their children wouldn't like meals. In fact, most children are usually ready to eat almost anything that is offered to them. A child often likes food unless...
【简答题】Some parents are worrying that their children wouldn’t like meals. In fact, most children are usually ready to eat almost anything that is offered to them. A child often likes food unless it is badly ...
【判断题】光纤传感器也是光电传感器的一种，它由光纤单元、放大器两部分组成。投光器和受光器均在放大器内，投光器发出的光线通过一条光纤内部从端面（光纤头）以约60°的角度扩散，照射到检测物体上；同样，反射回来的光线通过另一条光纤的内部回送到受光器。反射回来的光线量将由放大器内部的敏感元件检出，并转换为电气信号输出。
A.
正确
B.
错误
【判断题】光纤传感器也是光电传感器的一种，它由光纤单元、放大器两部分组成。投光器和受光器均在放大器内，投光器发出的光线通过一条光纤内部从端面（光纤头）以约60°的角度扩散，照射到检测物体上；同样，反射回来的光线通过另一条光纤的内部回送到受光器。反射回来的光线量将由放大器内部的敏感元件检出，并转换为电气信号输出。
A.
正确
B.
错误
【单选题】Some parents home school their children for the reason that ______.
A.
they would like their children to become artists or athletes sooner
B.
the education officials don't advocate diversified educational systems
C.
the government couldn't offer sufficient teaching facilities
D.
the school education doesn't meet their individual religious needs
【单选题】Some children don’t like to talk with their parents,but I am _______them.I love to talk with my parents.
A.
the same as
B.
different from
C.
pleased with
D.
interested in
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