实现下列变化时，需克服相同类型作用力的是 [ ]
A、二氧化硅和干冰的熔化
B、液溴和钠的气化
C、食盐和冰的熔化
D、纯碱和烧碱的熔化
答案：D
I'm new at the party and I don't have a friend ____. [ ]
A. to talk with
B. talking to
C. to talk
D. speaking to
什么叫焊接工艺评定的重要因素、补加因素和次要因素？
