维护需要打开全部应急出口门时，对滑梯释放机构（）
A.须逐个解除；
B.相应侧解除一个（A320）；
C.只须解除一个。
参考答案：A
单句改错。
1. After the terrible earthquake, the whole area lay in ruin. ___________________
2. The army organised teams to dig out those who were trapped and buried the dead. __________________
3. Judged from his words, he must have been a soldier. _________________
使用瞳距仪时一定要紧贴被检者的前额和鼻梁处，以（）。
A、减小瞳距误差
B、减小棱镜度误差
C、减小瞳高误差
D、减小顶焦度误差
