【判断题】平面一般力系平衡方程的二矩式为一个投影方程,两个力矩方程,同时附加条件:两矩心所连直线不得与所选投影轴垂直。
【简答题】平面一般力系的二矩式平衡方程为ΣFx=0, ΣMA(F)=0, ΣMB(F)=0,其附加条件是x轴不与A、B两点的连线( )。
【判断题】平面任意力系的平衡方程有三个,形式有三种,分别称为一般 式、二矩式、三矩式( )
【简答题】选择正确的句子完成对话。 A. you will narrow your mind if you always live in the country for a long time. B. But I feel that living in the city is more convenient C. How do you think the life in the country? D. Ho...
【判断题】平面一般力系,其独立的二力矩式平衡方程为 ∑Fx=0,∑MA=0,∑MB=0,但要求矩心A、B的连线不能与x轴垂直。( )
【单选题】When you map out your future, you __________.
B.
draw a sketch of it on paper
【简答题】III . Reading Comprehension Passage Two Imagine you enter a car with no steering wheel, no brake or accelerator pedals (踏板) . Under a voice-activated command, you say an address. "The fastest route wi...
【简答题】III . Reading Comprehension Passage Two Imagine you enter a car with no steering wheel, no brake or accelerator pedals (踏板) . Under a voice-activated command, you say an address. "The fastest route wi...
【单选题】心动过缓是指安静状态下成人心率每分钟少于
【简答题】给下列画线部分的字母找到合适的音标。 A. [i:] B. [ai] C. [t] D. [d] E. [b] F. [p] G. [ A ] H. [i] I. [ei] ( ) 1. b ike ( ) 2. d ifference ( ) 3. b ea t ( ) 4. sto p ( ...