是以圣王制外乐以禁内情,而为之节文。 为:()。
参考答案:为动用法,给……写。
All these gifts must be mailed immediately _ in time for Christmas.[ ]
A. in order to received
B. in order to receive
C. so as to be received
D. so as to be receiving
A.变压器输出功率为200W
B.若n1=100匝,则输出端线圈的磁通量变化率的最大值为2Wb/s
C.副线圈两端的电压表示数20V
D.变压器的输入功率是由发电厂的输出功率决定的