使用超过（）m的长绳时，可以酌情加上缓冲器、自锁器或防坠器等。
A、3
B、2
C、5
参考答案：A
The rescue work _______ three parts, of which saving the people’s lives is the most important one.[ ]
A. makes up of
B. consists of
C. links of
D. divides into
下面不属于基本逻辑运算的是（）。
A.与
B.或
C.非
D.真
