电线的绝缘层不能使用()。
A、易燃烧的材料
B、耐高温材料
C、耐磨材料
D、耐拉伸材料
参考答案:A
是某有机物与H2发生加成反应后的产物。符合该条件的稳定有机物共有
A.2种
B.3种
C.1种
D.4种
The cinema was crowded with many people, ____ many children ____ on their parents’ laps.
A.including; seated
B.including; seating
C.include; sat
D.included; sitting