求生者浸泡在水中生存的时间,主要取决于当时的水温。()
参考答案:对
Here are your new books! You must ______ them. [ ]
A. look for
B. look after
C. look at
D. look like
R134a制冷管路上的维修阀通常不是()型式。
A.管螺纹接头
B.快装接头
C.弹簧偶合
D.以上都正确