为了使两个进程能同步运行，最少需要（）个信号量。
A.1
B.2
C.3
D.4
参考答案：B
After the disaster, the first thing the local government did was to provide _____for the homeless families. [ ]
A. positions
B. equipment
C. accommodation
D. furniture
哪个间隙感染最易引起下颌升支部边缘性骨髓炎
A．颞下间隙 B．眶下间隙 C．咬肌间隙 D．翼下颌间隙 E．颌下间隙
de _____for the homeless families. [ ]