SDH段开销SOH中的定帧字节的作用是识别一帧的起始位置。
参考答案：对
Although police could be seen everywhere, they seemed to be searching the houses almost ________.[ ]
A. at ease
B. at random
C. at risk
D. at length
唾液中除含有唾液淀粉酶外还有（）
A.蛋白分解酶
B.溶菌酶
C.脂肪酶
D.肽酶
E.寡糖酶
