内部接线
参考答案:
通常指灯具内部且附带在灯具的接线。它构成外部接线或电源电缆的接线端子与灯座、开关和类似部件的接线端子之间的连接
Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school .
A.that
B.when
C.in which
D.for which
“二元经济”是指( )。
A.发达国家与发展中国家经济的不一致B.在欠发达国家中,男人和女人收入之间的不一致C.在欠发达国家中,较高收人与较低收入的不一致D.在欠发达国家中,农村与城市生活之间的不一致