对于具有外力作用的非保守机械系统,其拉格朗日动力函数L可定义为系统总动能与系统总势能之和。
参考答案:错
If you think that treating a woman well means always __________ her permission for things, think again.
A.gets
B.got
C.to get
D.getting
考虑:
A.乳痈
B.乳核
C.乳痨
D.乳发
E.乳疬