桥式接线有内桥和外桥两种形式。
参考答案:错
We narrowly escaped _____in the forest of South America 15 years ago.
A.killing
B.to be killed
C.to have been killed
D.being killed
首次提出社会主义社会基本矛盾的是
A.列宁
B.斯大林
C.毛 * *
D.刘 * *