M

平面一般力系向一点O简化结果，得到一个主矢量R′和一个主矩m₀，下列四种情况，属于平衡的应是（     ）。  

图示等截面圆轴，m-m截面将其等分为左右两段，左段为钢，右段为铝，两端受扭转力矩M后，左、右两段（     ） 。  

有n个进程并发执行时，系统允许每次最多m个进程(1≤m<n)同时使用某资源。若使用PV操作来管理，则信号量的变化范围是（ ）

I usually feel ______ if I’m interested in it.

Tom is so talkative. I'm sure you'll soon be familiar _______ him.

Hello, I’m Harry Potter. Hello, my name is Charles Green, but_______.

---I’m sorry. I lost the key. ---______________.

I’m sorry to hear that your father is suffering from a serious ____

—Glad to meet you again. How are you? —I'm just             .（老样子）

She got two more letters from him _____ the last one ______, Theodore F Stoddard, M. D