配电变压器一次及二次的额定电流、常用估算的方法求得、高压侧额定电流按容量的()。
A.3.5%
B.4.0%
C.6.0%
D.7.5%
参考答案:C
(2013·石家庄高三二模)—Jack, this is the third time that you have been late this week.
—Sorry, sir, but I was ________ for 15 minutes on the way here in the traffic jam.
A.given up
B.put up
C.taken up
D.held up
我国原始社会人体装饰的材质在新石器时代有:()、()、()、()、()