李平报销差旅费2730元,退回现金270元,结清预借款,该笔业务编制的会计分录是()。
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边长为α的等边三角形ABC在垂直平面内,用三根沿边长方向的直杆铰结,如图所示, CF杆水平,三角形平板上作用一已知力偶,其力偶矩为M,三角形平板重为P,略去杆重,试求CF杆对三角形平板的约束反力()。
You aren't quite yourself today.What’s wrong with you?
A. Thank you.
B. I can manage it by myself.
C. I' m suffering from a cold.
D. It's very kind of you.